$RDN
RADIAN GROUP INC Stock $rdn

$rdn Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-K Financial Statement

#000089092619000009 Filed on February 28, 2019

Income Statement

Concept	2017 Q4	2017 Q3	2017 Q2
Revenue	$39.70M	$312.1M	$302.9M
YoY Change	-20.44%	-2.75%	-8.26%
Cost Of Revenue	$23.35M	$27.24M	$25.64M
YoY Change	-30.94%	-7.49%	-6.32%
Gross Profit	$16.35M	$284.8M	$277.3M
YoY Change	1.62%	-2.27%	-8.43%
Gross Profit Margin	41.19%	91.27%	91.54%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$5.871M	$1.900M	$4.100M
YoY Change	5.23%	-34.48%	70.83%
% of Gross Profit	35.9%	0.67%	1.48%
Operating Expenses	$133.1M	$209.2M	$338.4M
YoY Change	-16.5%	7.89%	94.9%
Operating Profit	-$116.7M	$75.57M	-$61.11M
YoY Change	-18.53%	-22.48%	-147.3%
Interest Expense	-$14.90M	$15.72M	$16.18M
YoY Change	-13.87%	-20.56%	-28.24%
% of Operating Profit		20.79%
Other Income/Expense, Net
YoY Change
Pretax Income	$164.7M	$102.8M	-$35.47M
YoY Change	68.4%	-19.01%	-122.66%
Income Tax	$55.30M	$37.67M	-$8.132M
% Of Pretax Income	33.58%	36.64%
Net Earnings	$6.816M	$65.14M	-$27.34M
YoY Change	-88.84%	-21.33%	-127.87%
Net Earnings / Revenue	17.17%	20.88%	-9.03%
Basic Earnings Per Share		$0.30	-$0.13
Diluted Earnings Per Share	$0.03	$0.30	-$0.13
COMMON SHARES
Basic Shares Outstanding	215.6M shares	215.3M shares	215.2M shares
Diluted Shares Outstanding	220.3M shares	219.4M shares	215.2M shares

Balance Sheet

Concept	2017 Q4	2017 Q3	2017 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$80.57M	$61.92M	$56.92M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$72.60M	$97.00M	$78.50M
YoY Change	-6.44%	-44.12%	1.68%
LONG-TERM ASSETS
Property, Plant & Equipment	$38.29M	$88.12M	$87.54M
YoY Change	-45.81%	30.59%	48.88%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$4.644B	$4.547B	$4.584B
YoY Change	4.07%	-0.42%	-1.15%
Other Assets	$245.2M	$393.1M	$415.2M
YoY Change	-41.83%	-4.54%	-8.51%
Total Long-Term Assets	$5.828B	$5.747B	$5.739B
YoY Change	0.74%	-2.19%	-4.2%
TOTAL ASSETS
Total Short-Term Assets	$72.60M	$97.00M	$78.50M
Total Long-Term Assets	$5.828B	$5.747B	$5.739B
Total Assets	$5.901B	$5.844B	$5.817B
YoY Change	0.64%	-3.4%	-4.12%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities
YoY Change
LONG-TERM LIABILITIES
Long-Term Debt	$1.027B	$1.027B	$989.0M
YoY Change	-3.96%	-3.83%	-22.62%
Other Long-Term Liabilities	$353.8M	$360.8M	$379.1M
YoY Change	9.91%	-12.72%	28.73%
Total Long-Term Liabilities	$1.381B	$1.388B	$1.368B
YoY Change	-0.75%	-6.31%	-13.0%
TOTAL LIABILITIES
Total Short-Term Liabilities
Total Long-Term Liabilities	$1.381B	$1.388B	$1.368B
Total Liabilities	$2.901B	$2.856B	$2.903B
YoY Change	-3.01%	-9.65%	-11.0%
SHAREHOLDERS EQUITY
Retained Earnings	$1.116B	$1.110B	$1.045B
YoY Change	11.87%	18.43%	22.27%
Common Stock	$2.755B	$2.748B	$2.744B
YoY Change	-0.92%	1184221.55%	1182703.88%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$893.9M	$893.8M	$893.5M
YoY Change	0.06%	0.06%	0.04%
Treasury Stock Shares	17.60M shares	17.60M shares	17.58M shares
Shareholders Equity	$3.000B	$2.988B	$2.914B
YoY Change
Total Liabilities & Shareholders Equity	$5.901B	$5.844B	$5.817B
YoY Change	0.64%	-3.4%	-4.12%

Cashflow Statement

Concept	2017 Q4	2017 Q3	2017 Q2
OPERATING ACTIVITIES
Net Income	$6.816M	$65.14M	-$27.34M
YoY Change	-88.84%	-21.33%	-127.87%
Depreciation, Depletion And Amortization	$5.871M	$1.900M	$4.100M
YoY Change	5.23%	-34.48%	70.83%
Cash From Operating Activities	$142.2M	$12.00M	$122.5M
YoY Change	50.8%	-91.22%	9.47%
INVESTING ACTIVITIES
Capital Expenditures	-$3.500M	-$11.80M	-$5.700M
YoY Change	-51.39%	0.85%	-43.56%
Acquisitions
YoY Change
Other Investing Activities	-$122.7M	-$13.30M	-$93.00M
YoY Change	50.18%	-112.72%	-2.41%
Cash From Investing Activities	-$126.3M	-$25.00M	-$98.70M
YoY Change	41.91%	-126.88%	-6.45%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-18.80M	29.40M	-27.80M
YoY Change	18700.0%	-112.39%	66.47%
NET CHANGE
Cash From Operating Activities	142.2M	12.00M	122.5M
Cash From Investing Activities	-126.3M	-25.00M	-98.70M
Cash From Financing Activities	-18.80M	29.40M	-27.80M
Net Change In Cash	-2.900M	16.40M	-4.000M
YoY Change	-155.77%	-315.79%	-61.17%
FREE CASH FLOW
Cash From Operating Activities	$142.2M	$12.00M	$122.5M
Capital Expenditures	-$3.500M	-$11.80M	-$5.700M
Free Cash Flow	$145.7M	$23.80M	$128.2M
YoY Change	43.55%	-83.95%	5.08%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2018	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2018	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2018	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2018
CY2018	dei	Document Period End Date DocumentPeriodEndDate	2018-12-31
CY2018	dei	Document Type DocumentType	10-K
CY2018	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2018	dei	Entity Central Index Key EntityCentralIndexKey	0000890926
CY2019Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	213657506	shares
CY2018	dei	Entity Shell Company EntityShellCompany	false
CY2018	dei	Entity Small Business EntitySmallBusiness	false
CY2018	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2018	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2018Q2	dei	Entity Public Float EntityPublicFloat	3449403478	USD
CY2018	dei	Entity Registrant Name EntityRegistrantName	Radian Group Inc.
CY2018	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2018	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2018	rdn	Maximum Maturity Duration For Short Term Investment Grouping MaximumMaturityDurationForShortTermInvestmentGrouping	P3M
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CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-10270000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-2642000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	2251000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-87086000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	34545000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	6531000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	5000	USD
CY2017	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	150000	USD
CY2016	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-474000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	1000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	-721000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	4000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	871000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-474000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	129000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	64000	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	25000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-86953000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	35480000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	6082000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	519058000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	156568000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	314335000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	606011000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	121088000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	308253000	USD
CY2018	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	-42476000	USD
CY2017	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	3621000	USD
CY2016	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	30751000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-51469000	USD
CY2016	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-75075000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	120573000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	166527000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	170887000	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018	rdn	Increase Decreasein Goodwilland Intangible Assetsincluding Restructuring IncreaseDecreaseinGoodwillandIntangibleAssetsincludingRestructuring	12429000	USD
CY2017	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	184374000	USD
CY2016	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2017	rdn	Increase Decreasein Goodwilland Intangible Assetsincluding Restructuring IncreaseDecreaseinGoodwillandIntangibleAssetsincludingRestructuring	27797000	USD
CY2016	rdn	Increase Decreasein Goodwilland Intangible Assetsincluding Restructuring IncreaseDecreaseinGoodwillandIntangibleAssetsincludingRestructuring	13221000	USD
CY2018	rdn	Depreciation Amortizationand Accretion Other Net DepreciationAmortizationandAccretionOtherNet	56661000	USD
CY2017	rdn	Depreciation Amortizationand Accretion Other Net DepreciationAmortizationandAccretionOtherNet	58038000	USD
CY2016	rdn	Depreciation Amortizationand Accretion Other Net DepreciationAmortizationandAccretionOtherNet	57795000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	4599000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-3628000	USD
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	16011000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	31119000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	157071000	USD
CY2016	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	188947000	USD
CY2018	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	15419000	USD
CY2017	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	42716000	USD
CY2016	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	862000	USD
CY2018	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	-109642000	USD
CY2017	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	-252681000	USD
CY2016	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	-216135000	USD
CY2018	us-gaap	Increase Decrease In Funds Held Under Reinsurance Agreements IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements	-32814000	USD
CY2017	us-gaap	Increase Decrease In Funds Held Under Reinsurance Agreements IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements	-130397000	USD
CY2016	us-gaap	Increase Decrease In Funds Held Under Reinsurance Agreements IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements	-158001000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-43562000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	16491000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	7662000	USD
CY2018	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	-106799000	USD
CY2017	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	4405000	USD
CY2016	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	57136000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	677786000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	360575000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	381724000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	728584000	USD
CY2017	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	888219000	USD
CY2016	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	687173000	USD
CY2018	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	58317000	USD
CY2017	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	194784000	USD
CY2016	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	290855000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	95697000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	38318000	USD
CY2016	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	74868000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	457595000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	463548000	USD
CY2016	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	337630000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	7132000	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	717000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	50053000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	6000	USD
CY2018	us-gaap	Proceeds From Maturities Repayments And Calls Of Trading Securities Heldforinvestment ProceedsFromMaturitiesRepaymentsAndCallsOfTradingSecuritiesHeldforinvestment	54329000	USD
CY2017	us-gaap	Proceeds From Maturities Repayments And Calls Of Trading Securities Heldforinvestment ProceedsFromMaturitiesRepaymentsAndCallsOfTradingSecuritiesHeldforinvestment	79296000	USD
CY2016	us-gaap	Proceeds From Maturities Repayments And Calls Of Trading Securities Heldforinvestment ProceedsFromMaturitiesRepaymentsAndCallsOfTradingSecuritiesHeldforinvestment	123645000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1875069000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1947916000	USD
CY2016	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1990652000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	69160000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	213469000	USD
CY2016	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	830000	USD
CY2018	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	108325000	USD
CY2017	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-324258000	USD
CY2016	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-334456000	USD
CY2018	us-gaap	Proceeds From Sale Of Other Assets Investing Activities ProceedsFromSaleOfOtherAssetsInvestingActivities	2590000	USD
CY2017	us-gaap	Proceeds From Sale Of Other Assets Investing Activities ProceedsFromSaleOfOtherAssetsInvestingActivities	882000	USD
CY2016	us-gaap	Proceeds From Sale Of Other Assets Investing Activities ProceedsFromSaleOfOtherAssetsInvestingActivities	2489000	USD
CY2018	rdn	Net Cash Received Transferred In Sale Of Subsidiaries NetCashReceivedTransferredInSaleOfSubsidiaries	0	USD
CY2017	rdn	Net Cash Received Transferred In Sale Of Subsidiaries NetCashReceivedTransferredInSaleOfSubsidiaries	-650000	USD
CY2016	rdn	Net Cash Received Transferred In Sale Of Subsidiaries NetCashReceivedTransferredInSaleOfSubsidiaries	0	USD
CY2018	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	26008000	USD
CY2017	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	28676000	USD
CY2016	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	35542000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	7964000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	86000	USD
CY2016	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	150000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-689414000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-201492000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-176058000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	2140000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	2154000	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	2105000	USD
CY2018	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	0	USD
CY2017	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	442163000	USD
CY2016	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	343417000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	593527000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	445072000	USD
CY2018	us-gaap	Proceeds From Hedge Financing Activities ProceedsFromHedgeFinancingActivities	0	USD
CY2017	us-gaap	Proceeds From Hedge Financing Activities ProceedsFromHedgeFinancingActivities	4208000	USD
CY2016	us-gaap	Proceeds From Hedge Financing Activities ProceedsFromHedgeFinancingActivities	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1385000	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	100188000	USD
CY2018	rdn	Lineof Credit Facility Paymentof Commitment Fees LineofCreditFacilityPaymentofCommitmentFees	1510000	USD
CY2017	rdn	Lineof Credit Facility Paymentof Commitment Fees LineofCreditFacilityPaymentofCommitmentFees	1993000	USD
CY2016	rdn	Lineof Credit Facility Paymentof Commitment Fees LineofCreditFacilityPaymentofCommitmentFees	0	USD
CY2018	us-gaap	Increase Decrease In Securities Lending Payable IncreaseDecreaseInSecuritiesLendingPayable	39342000	USD
CY2017	us-gaap	Increase Decrease In Securities Lending Payable IncreaseDecreaseInSecuritiesLendingPayable	19357000	USD
CY2016	us-gaap	Increase Decrease In Securities Lending Payable IncreaseDecreaseInSecuritiesLendingPayable	0	USD
CY2018	us-gaap	Proceeds From Short Term Debt Maturing In More Than Three Months ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths	56449000	USD
CY2017	us-gaap	Proceeds From Short Term Debt Maturing In More Than Three Months ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths	0	USD
CY2016	us-gaap	Proceeds From Short Term Debt Maturing In More Than Three Months ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths	0	USD
CY2018	us-gaap	Repayments Of Short Term Debt Maturing In More Than Three Months RepaymentsOfShortTermDebtMaturingInMoreThanThreeMonths	20917000	USD
CY2017	us-gaap	Repayments Of Short Term Debt Maturing In More Than Three Months RepaymentsOfShortTermDebtMaturingInMoreThanThreeMonths	0	USD
CY2016	us-gaap	Repayments Of Short Term Debt Maturing In More Than Three Months RepaymentsOfShortTermDebtMaturingInMoreThanThreeMonths	0	USD
CY2018	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
CY2017	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0	USD
CY2016	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	333000	USD
CY2018	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	170000	USD
CY2017	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	264000	USD
CY2016	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	371000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	22386000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-125084000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-203269000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	0	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	431000	USD
CY2016	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-481000	USD
CY2018	rdn	Cashand Restricted Cash Period Increase Decrease Including Discontinued Operations CashandRestrictedCashPeriodIncreaseDecreaseIncludingDiscontinuedOperations	10758000	USD
CY2017	rdn	Cashand Restricted Cash Period Increase Decrease Including Discontinued Operations CashandRestrictedCashPeriodIncreaseDecreaseIncludingDiscontinuedOperations	34430000	USD
CY2016	rdn	Cashand Restricted Cash Period Increase Decrease Including Discontinued Operations CashandRestrictedCashPeriodIncreaseDecreaseIncludingDiscontinuedOperations	1916000	USD
CY2017Q4	rdn	Cashand Restricted Cash CashandRestrictedCash	96244000	USD
CY2016Q4	rdn	Cashand Restricted Cash CashandRestrictedCash	61814000	USD
CY2015Q4	rdn	Cashand Restricted Cash CashandRestrictedCash	59898000	USD
CY2018Q4	rdn	Cashand Restricted Cash CashandRestrictedCash	107002000	USD
CY2017Q4	rdn	Cashand Restricted Cash CashandRestrictedCash	96244000	USD
CY2016Q4	rdn	Cashand Restricted Cash CashandRestrictedCash	61814000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	8364000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	94328000	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-673000	USD
CY2018	us-gaap	Interest Paid InterestPaid	56688000	USD
CY2017	us-gaap	Interest Paid InterestPaid	57453000	USD
CY2016	us-gaap	Interest Paid InterestPaid	65531000	USD
CY2018	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2018	us-gaap	Restructuring Charges RestructuringCharges	2500000	USD
CY2018	us-gaap	Payments For Restructuring PaymentsForRestructuring	2000000.0	USD
CY2017	us-gaap	Restructuring Charges RestructuringCharges	17300000	USD
CY2017	us-gaap	Payments For Restructuring PaymentsForRestructuring	6800000	USD
	us-gaap	Restructuring Charges RestructuringCharges	19800000	USD
CY2018	us-gaap	Use Of Estimates UseOfEstimates	Use of EstimatesThe preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of our contingent assets and liabilities at the dates of the financial statements, as well as the reported amounts of revenues and expenses during the reporting periods. While the amounts included in our consolidated financial statements include our best estimates and assumptions, actual results may vary materially.
CY2018	us-gaap	Revenue Recognition Sales Of Services RevenueRecognitionSalesOfServices	Our Services segment revenues are recognized over time and measured each period based on the progress to date as services are performed and made available to customers. Our contracts with customers, including payment terms, are generally short-term in nature; therefore, any impact related to timing is immaterial. Revenue recognized related to services made available to customers and billed is reflected in accounts and notes receivable. Revenue recognized related to services performed and not yet billed is recorded in unbilled receivables and reflected in other assets. We have <span style="font-family:inherit;font-size:10pt;"><span>no</span></span><span style="font-family:inherit;font-size:10pt;"> material bad-debt expense. The following represents balances related to Services contracts as of the dates indicated: </span><div style="line-height:120%;padding-bottom:12px;text-align:left;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:72.31968810916179%;border-collapse:collapse;text-align:left;"><tr><td colspan="8"/></tr><tr><td style="width:59%;"/><td style="width:1%;"/><td style="width:18%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:18%;"/><td style="width:1%;"/></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:8pt;"><span style="font-family:inherit;font-size:8pt;font-weight:bold;text-decoration:underline;">(In thousands)</span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#bec7cc;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:8pt;"><span style="font-family:inherit;font-size:8pt;font-weight:bold;">December 31, 2018</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:8pt;"><span style="font-family:inherit;font-size:8pt;font-weight:bold;">December 31, 2017</span></div></td></tr><tr><td style="vertical-align:bottom;background-color:;padding-left:20px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Accounts Receivable - Services Contracts</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#bec7cc;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;background-color:#bec7cc;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>15,461</span></span></div></td><td style="vertical-align:bottom;background-color:#bec7cc;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>17,391</span></span></div></td><td style="vertical-align:bottom;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:bottom;background-color:;padding-left:20px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Unbilled Receivables - Services Contracts</span></div></td><td colspan="2" style="vertical-align:bottom;background-color:#bec7cc;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>19,917</span></span></div></td><td style="vertical-align:bottom;background-color:#bec7cc;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>22,257</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:bottom;background-color:;padding-left:20px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Deferred Revenues - Services Contracts</span></div></td><td colspan="2" style="vertical-align:bottom;background-color:#bec7cc;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>3,204</span></span></div></td><td style="vertical-align:bottom;background-color:#bec7cc;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>3,235</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr></table></div><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;padding-top:6px;text-align:left;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Revenue expected to be recognized in any future period related to remaining performance obligations, such as contracts where revenue is recognized as invoiced and contracts with variable consideration related to undelivered performance obligations, is not material.</span></div><div style="line-height:120%;padding-top:6px;text-indent:24px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Fee-for-Service Contracts </span></div><div style="line-height:120%;padding-top:6px;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Generally, our contracts with our clients do not include minimum volume commitments and can be terminated at any time by our clients. Although some of our contracts and assignments are recurring in nature, and include repetitive monthly assignments, a significant portion of our engagements are transactional in nature and may be performed in connection with securitizations, loan sales, loan purchases or other transactions. Due to the transactional nature of our business, our Services segment revenues may fluctuate from period to period as transactions are commenced or completed. We do not recognize revenue or expense related to amounts advanced by us and subsequently reimbursed by clients for maintenance or repairs, because we do not take control of the service prior to the client taking control. We record an expense if an advance is made by us that is not in accordance with a client contract, and the client is not obligated to reimburse us.</span></div><div style="line-height:120%;padding-top:6px;text-align:left;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Due to the nature of the services provided, our Services arrangements with customers may include any of the following three basic types of contracts:</span></div><div style="line-height:120%;padding-top:6px;text-align:left;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Fixed-Price Contracts. </span><span style="font-family:inherit;font-size:10pt;">We use fixed-price contracts in our real estate valuation and component services, our loan review, underwriting and due diligence services as well as our title and closing services. We also use fixed-price contracts in our surveillance business for our servicer oversight services and RMBS surveillance services, and in our asset management business activities. Under fixed-price contracts we agree to perform the specified services and deliverables for a pre-determined per-unit or per-file price or day rate. Each service qualifies as a separate performance obligation and revenue is recognized as the service performed is made available to the client.</span></div><div style="line-height:120%;padding-top:6px;text-align:left;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Time-and-Expense Contracts.</span><span style="font-family:inherit;font-size:10pt;"> The Services segment also derives a portion of its revenue from professional service activities under time-and-expense contracts. In these types of contracts, we are paid a fixed hourly rate, and we are reimbursed for billable out-of-pocket expenses as work is performed. These contracts are used in our loan review, underwriting and due diligence services. Services revenue consisting of billed time fees and pass-through expenses is recorded over time and based on the progress to date as services are performed and made available to customers. Services revenue may also include expenses billed to clients, which includes travel and other out-of-pocket expenses, and other reimbursable expenses.</span></div><div style="line-height:120%;padding-top:6px;text-align:left;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Percentage-of-Sale Contracts. </span><span style="font-family:inherit;font-size:10pt;">Under percentage-of-sale contracts, we are paid a contractual percentage of the sale proceeds upon the sale of each property. These contracts are only used for a portion of our REO management services and our real estate brokerage services. In addition, through the use of our proprietary technology, property leads are sent to select clients. Revenue attributable to services provided under a percentage-of-sale contract is recognized over time and measured based on the progress to date and typically coincides with the client’s successful closing on the property. The revenue recognized for these transactions is based on a percentage of the sale.</span></div><div style="line-height:120%;padding-top:6px;text-align:left;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">In certain instances, fees are received at the time that an asset is assigned to Radian for management. These fees are recorded as deferred revenue and are recognized over time based on progress to date and the availability to customers.</span></div><div style="line-height:120%;padding-top:12px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Cost of Services</span></div><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Cost of services consists primarily of employee compensation and related payroll benefits, the cost of billable labor assigned to revenue-generating activities, as well as corresponding travel and related expenses incurred in providing such services to clients in our Services segment. Cost of services also includes costs paid to outside vendors, including real estate </span></div>agents that provide valuation and related services, as well as data acquisition costs and other compensation-related expenses to maintain software application platforms that directly support our businesses. Cost of services does not include an allocation of overhead costs.
CY2018Q4	rdn	Cashand Restricted Cash CashandRestrictedCash	107000000.0	USD
CY2018Q4	us-gaap	Cash Cash	95400000	USD
CY2018Q4	us-gaap	Restricted Cash RestrictedCash	11600000	USD
CY2017Q4	rdn	Cashand Restricted Cash CashandRestrictedCash	96200000	USD
CY2017Q4	us-gaap	Cash Cash	80500000	USD
CY2017Q4	us-gaap	Restricted Cash RestrictedCash	15700000	USD
CY2018Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	19900000	USD
CY2018	us-gaap	Description Of New Accounting Pronouncements Not Yet Adopted DescriptionOfNewAccountingPronouncementsNotYetAdopted	<span>In February 2016, the FASB issued an update that replaces the existing accounting and disclosure requirements for leases of property, plant and equipment. The update requires lessees to recognize, as of the lease commencement date, assets and liabilities for all leases with lease terms of more than 12 months, which is a change from the current GAAP requirement to recognize only capital leases on the balance sheet. Leases are required to be classified as either operating or finance, with expense on operating leases recorded as a single lease cost on a straight-line basis. For finance leases, interest expense on the lease liability is required to be recognized separately from the straight-line amortization of the right-of-use asset. Quantitative disclosures are required for certain items, including the cost of leases, the weighted-average remaining lease term, the weighted-average discount rate and a maturity analysis of lease liabilities. Additional qualitative disclosures are also required regarding the nature of the leases, such as basis, terms and conditions of: (i) variable interest payments; (ii) extension and termination options; and (iii) residual value guarantees. In July 2018 the FASB issued a further update containing certain targeted improvements to the accounting and disclosure requirements for leases, including an additional (and optional) transition method to recognize the cumulative-effect adjustment as of the beginning of the period of adoption, rather than recognizing the cumulative-effect adjustment as of the beginning of the earliest comparative period presented. We expect to elect the optional transition method to recognize the cumulative-effect adjustment as of the beginning </span><span style="font-size:11pt;"> </span><span style="font-family:inherit;font-size:10pt;"><span>$50 million</span></span><span style="font-family:inherit;font-size:10pt;">, which represents a right of use asset, and a corresponding net increase in other liabilities for the same amount. The net increase of approximately </span><span style="font-family:inherit;font-size:10pt;"><span>$50 million</span></span><span style="font-family:inherit;font-size:10pt;"> in other liabilities represents a discounted lease liability of approximately </span><span style="font-family:inherit;font-size:10pt;"><span>$74 million</span></span><span style="font-family:inherit;font-size:10pt;"> from operating leases, primarily for our various facilities, which represents the present value of these future lease payments discounted at our incremental borrowing rate, partially offset by an adjustment for unamortized allowances and incentives. Additionally, upon adoption we expect to expand our financial statement disclosures as required by the amendments, as well as implement any necessary changes to our control environment and reporting processes to reflect the requirements of the amendments. See Note</span><span style="font-family:inherit;font-size:10pt;"> </span><span style="font-family:inherit;font-size:10pt;">14</span><span style="font-family:inherit;font-size:10pt;"> </span><span style="font-family:inherit;font-size:10pt;">for additional information about our leases.</span><span style="font-family:inherit;font-size:10pt;"> </span><span>However, we do not expect the adoption of this standard to impact our stockholders’ equity, results of operations or liquidity. In addition, we expect to elect the practical expedients for transitioning existing leases to the new standard as of the effective date. As a result of applying the practical expedients: (i) we are not required to reassess expired or existing contracts to determine if they contain additional leases; (ii) we are not required to reassess the lease classification for expired and existing leases; and (iii) we are not required to reassess initial direct costs for existing leases. The update is effective for us on January 1, 2019 and upon our adoption, we expect to record an increase in other assets of approximately </span><span style="font-family:inherit;font-size:10pt;"><span>$50 million</span></span><span style="font-family:inherit;font-size:10pt;">, which represents a right of use asset, and a corresponding net increase in other liabilities for the same amount. The net increase of approximately </span><span style="font-family:inherit;font-size:10pt;"><span>$50 million</span></span><span style="font-family:inherit;font-size:10pt;"> in other liabilities represents a discounted lease liability of approximately </span><span style="font-family:inherit;font-size:10pt;"><span>$74 million</span></span><span style="font-family:inherit;font-size:10pt;"> from operating leases, primarily for our various facilities, which represents the present value of these future lease payments discounted at our incremental borrowing rate, partially offset by an adjustment for unamortized allowances and incentives. Additionally, upon adoption we expect to expand our financial statement disclosures as required by the amendments, as well as implement any necessary changes to our control environment and reporting processes to reflect the requirements of the amendments. See Note</span><span style="font-family:inherit;font-size:10pt;"> </span><span style="font-family:inherit;font-size:10pt;">14</span><span style="font-family:inherit;font-size:10pt;"> </span><span style="font-family:inherit;font-size:10pt;">for additional information about our leases.</span><span style="font-family:inherit;font-size:10pt;"> </span><div style="line-height:120%;padding-top:6px;text-align:left;font-size:10pt;"><span>of the period of adoption.</span><span style="font-family:inherit;font-size:10pt;"><span>$50 million</span></span><span style="font-family:inherit;font-size:10pt;">, which represents a right of use asset, and a corresponding net increase in other liabilities for the same amount. The net increase of approximately </span><span style="font-family:inherit;font-size:10pt;"><span>$50 million</span></span><span style="font-family:inherit;font-size:10pt;"> in other liabilities represents a discounted lease liability of approximately </span><span style="font-family:inherit;font-size:10pt;"><span>$74 million</span></span><span style="font-family:inherit;font-size:10pt;"> from operating leases, primarily for our various facilities, which represents the present value of these future lease payments discounted at our incremental borrowing rate, partially offset by an adjustment for unamortized allowances and incentives. Additionally, upon adoption we expect to expand our financial statement disclosures as required by the amendments, as well as implement any necessary changes to our control environment and reporting processes to reflect the requirements of the amendments. See Note</span><span style="font-family:inherit;font-size:10pt;"> </span><span style="font-family:inherit;font-size:10pt;">14</span><span style="font-family:inherit;font-size:10pt;"> </span><span style="font-family:inherit;font-size:10pt;">for additional information about our leases.</span><span style="font-family:inherit;font-size:10pt;"> </span></div><div style="line-height:120%;padding-top:8px;text-align:left;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">In June 2016, the FASB issued an update to the accounting standard regarding the measurement of credit losses on financial instruments and certain other assets. This update requires that financial assets measured at their amortized cost basis be presented at the net amount expected to be collected. Credit losses relating to available-for-sale debt securities are to be recorded through an allowance for credit losses, rather than a write-down of the asset, with the amount of the allowance limited to the amount by which fair value is less than amortized cost. This update is effective for public companies for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. This update is not applicable to credit losses associated with our mortgage insurance policies. We are currently evaluating the impact on our financial statements and future disclosures as a result of this update.</span><span style="font-family:inherit;font-size:10pt;"> </span></div><div style="line-height:120%;padding-top:8px;text-align:left;text-indent:30px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">In March 2017, the FASB issued an update to the accounting standard regarding receivables. The new standard requires certain premiums on purchased callable debt securities to be amortized to the earliest call date. The amortization period for callable debt securities purchased at a discount will not be impacted. The provisions of this update are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. We do not expect the adoption of this update to have a material effect on our financial statements and disclosures.</span><span style="font-family:inherit;font-size:10pt;"> </span></div><div style="line-height:120%;padding-top:8px;text-align:left;text-indent:32px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">In August 2018, the FASB issued an update to the accounting standard regarding the accounting for long-duration insurance contracts. The new standard: (i) requires that assumptions used to measure the liability for future policy benefits be reviewed at least annually; (ii) defines and simplifies the measurement of market risk benefits; (iii) simplifies the amortization of deferred acquisition costs; and (iv) enhances the required disclosures about long-duration contracts. This update is effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. Early adoption is permitted. We are currently evaluating the potential impact of the adoption of this update.</span><span style="font-family:inherit;font-size:10pt;"> </span></div><span style="font-family:inherit;font-size:10pt;">In August 2018, the FASB issued an update to the accounting standard regarding the capitalization of implementation costs for activities performed in a cloud computing arrangement that is a service contract. The new standard aligns the accounting for implementation costs of hosting arrangements that are service contracts with the accounting for capitalizing internal-use software. This update is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. We are currently evaluating the potential impact of the adoption of this update and do not expect it to have a material effect on our financial statements and disclosures.</span>
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	308253000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	606011000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	121088000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	606011000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	120873000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	314069000	USD
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	214267000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	215321000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	211789000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	4286000	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	4305000	shares
CY2016	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2999000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	218553000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	220406000	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	229258000	shares
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.83
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.56
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.46
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.77
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.55
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.37
CY2018	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2018	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	-42500000	USD
CY2017	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	3600000	USD
CY2016	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	30800000	USD
CY2018	rdn	Operating Income Loss Pre Tax Non Gaap OperatingIncomeLossPreTaxNonGAAP	745495000	USD
CY2017	rdn	Operating Income Loss Pre Tax Non Gaap OperatingIncomeLossPreTaxNonGAAP	617175000	USD
CY2016	rdn	Operating Income Loss Pre Tax Non Gaap OperatingIncomeLossPreTaxNonGAAP	541750000	USD
CY2018	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	-42476000	USD
CY2017	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	3621000	USD
CY2016	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	30751000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-51469000	USD
CY2016	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-75075000	USD
CY2018	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	881000	USD
CY2017	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	105000	USD
CY2016	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	519000	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2017	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	184374000	USD
CY2016	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018	rdn	Increase Decreasein Goodwilland Intangible Assets IncreaseDecreaseinGoodwillandIntangibleAssets	12429000	USD
CY2017	rdn	Increase Decreasein Goodwilland Intangible Assets IncreaseDecreaseinGoodwillandIntangibleAssets	27671000	USD
CY2016	rdn	Increase Decreasein Goodwilland Intangible Assets IncreaseDecreaseinGoodwillandIntangibleAssets	13221000	USD
CY2018	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	5523000	USD
CY2017	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	10440000	USD
CY2016	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	0	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	684186000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	346737000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	483686000	USD
CY2018Q4	us-gaap	Securities Received As Collateral SecuritiesReceivedAsCollateral	11700000	USD
CY2017Q4	us-gaap	Securities Received As Collateral SecuritiesReceivedAsCollateral	19400000	USD
CY2017Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	3617103000	USD
CY2017Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	3649447000	USD
CY2017Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	48778000	USD
CY2017Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	16434000	USD
CY2018Q4	us-gaap	Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear	550	security
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	2201228000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	50707000	USD
CY2018Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear	237	security
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	957742000	USD
CY2017Q4	us-gaap	Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear	332	security
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	37333000	USD
CY2018Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	787	security
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	3158970000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	88040000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	1338867000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	9827000	USD
CY2017Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear	72	security
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	262531000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	6607000	USD
CY2017Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	404	security
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	1601398000	USD
CY2017Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	16434000	USD
CY2018	rdn	Other Than Temporary Impairment Losses Investments Credit Losses Portion Recognizedin Aoci OtherThanTemporaryImpairmentLossesInvestmentsCreditLossesPortionRecognizedinAOCI	0	USD
CY2018	rdn	Other Than Temporary Impairment Losses Investments Credit Losses Portion Recognizedin Earnings OtherThanTemporaryImpairmentLossesInvestmentsCreditLossesPortionRecognizedinEarnings	0	USD
CY2016	rdn	Other Than Temporary Impairment Losses Investments Credit Losses Portion Recognizedin Earnings OtherThanTemporaryImpairmentLossesInvestmentsCreditLossesPortionRecognizedinEarnings	0	USD
CY2018Q4	us-gaap	Trading Securities TradingSecurities	469071000	USD
CY2017Q4	us-gaap	Trading Securities TradingSecurities	606434000	USD
CY2018	rdn	Securities Lending Rateof Collateral Required SecuritiesLendingRateofCollateralRequired	1.02
CY2018	us-gaap	Repurchase Agreements Securities Lending Transactions And Repurchase To Maturity Transactions Accounted For As Secured Borrowings Description Of Potential Risks RepurchaseAgreementsSecuritiesLendingTransactionsAndRepurchaseToMaturityTransactionsAccountedForAsSecuredBorrowingsDescriptionOfPotentialRisks	The Borrower generally may return the loaned securities to us at any time, which would require us to return the collateral within the standard settlement period for the loaned securities on the principal exchange or market in which the securities are traded. We manage this liquidity risk associated with cash collateral by maintaining the cash collateral in a short-term money-market fund with daily availability. The credit risk under these programs is reduced by the amounts of collateral received. On a daily basis, the value of the underlying securities that we have loaned to the Borrowers is compared to the value of cash and securities collateral we received from the Borrowers, and additional cash or securities are requested or returned, as applicable. In addition, we are indemnified against counterparty credit risk by the intermediary.
CY2018Q4	us-gaap	Securities Loaned Amount Offset Against Collateral SecuritiesLoanedAmountOffsetAgainstCollateral	0	USD
CY2018	us-gaap	Gross Investment Income Operating GrossInvestmentIncomeOperating	159955000	USD
CY2017	us-gaap	Gross Investment Income Operating GrossInvestmentIncomeOperating	133648000	USD
CY2016	us-gaap	Gross Investment Income Operating GrossInvestmentIncomeOperating	120213000	USD
CY2018	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	7480000	USD
CY2017	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	6400000	USD
CY2016	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	6747000	USD
CY2018	us-gaap	Investment Income Net InvestmentIncomeNet	152475000	USD
CY2017	us-gaap	Investment Income Net InvestmentIncomeNet	127248000	USD
CY2016	us-gaap	Investment Income Net InvestmentIncomeNet	113466000	USD
CY2018	us-gaap	Gain Loss On Sale Of Other Investments GainLossOnSaleOfOtherInvestments	66000	USD
CY2017	us-gaap	Gain Loss On Sale Of Other Investments GainLossOnSaleOfOtherInvestments	32000	USD
CY2016	us-gaap	Gain Loss On Sale Of Other Investments GainLossOnSaleOfOtherInvestments	64000	USD
CY2018	rdn	Realized Gains Losseson Investments Net RealizedGainsLossesonInvestmentsNet	-12094000	USD
CY2017	rdn	Realized Gains Losseson Investments Net RealizedGainsLossesonInvestmentsNet	-8603000	USD
CY2016	rdn	Realized Gains Losseson Investments Net RealizedGainsLossesonInvestmentsNet	4313000	USD
CY2018	us-gaap	Impairment Of Investments ImpairmentOfInvestments	1744000	USD
CY2017	us-gaap	Impairment Of Investments ImpairmentOfInvestments	1420000	USD
CY2016	us-gaap	Impairment Of Investments ImpairmentOfInvestments	526000	USD
CY2018	us-gaap	Unrealized Gain Loss On Securities UnrealizedGainLossOnSecurities	-27287000	USD
CY2017	us-gaap	Unrealized Gain Loss On Securities UnrealizedGainLossOnSecurities	13230000	USD
CY2016	us-gaap	Unrealized Gain Loss On Securities UnrealizedGainLossOnSecurities	27217000	USD
CY2018	us-gaap	Gain Loss On Investments GainLossOnInvestments	-41125000	USD
CY2017	us-gaap	Gain Loss On Investments GainLossOnInvestments	3207000	USD
CY2016	us-gaap	Gain Loss On Investments GainLossOnInvestments	31004000	USD
CY2018	rdn	Net Gains Losses On Other Financial Instruments NetGainsLossesOnOtherFinancialInstruments	-1351000	USD
CY2017	rdn	Net Gains Losses On Other Financial Instruments NetGainsLossesOnOtherFinancialInstruments	414000	USD
CY2016	rdn	Net Gains Losses On Other Financial Instruments NetGainsLossesOnOtherFinancialInstruments	-253000	USD
CY2018	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	-42476000	USD
CY2017	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	3621000	USD
CY2016	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	30751000	USD
CY2018	rdn	Changein Unrealized Holding Gain Loss ChangeinUnrealizedHoldingGainLoss	-25348000	USD
CY2017	rdn	Changein Unrealized Holding Gain Loss ChangeinUnrealizedHoldingGainLoss	8827000	USD
CY2016	rdn	Changein Unrealized Holding Gain Loss ChangeinUnrealizedHoldingGainLoss	16850000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	88400000	USD
CY2017Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	0	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	12400000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	11800000	USD
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13200000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	8688000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	7321000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	5907000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	5375000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	4923000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	12692000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	44906000	USD
CY2018	us-gaap	Finite Lived Intangible Assets Remaining Amortization Period1 FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1	P15Y
CY2018Q4	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Assets VariableInterestEntityNonconsolidatedCarryingAmountAssets	434034000	USD
CY2018Q4	us-gaap	Variable Interest Entity Entity Maximum Loss Exposure Amount VariableInterestEntityEntityMaximumLossExposureAmount	435148000	USD
CY2018Q4	us-gaap	Deposit Assets DepositAssets	0	USD
CY2017Q4	us-gaap	Deposit Assets DepositAssets	88557000	USD
CY2018Q4	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	83377000	USD
CY2017Q4	us-gaap	Life Insurance Corporate Or Bank Owned Amount LifeInsuranceCorporateOrBankOwnedAmount	85862000	USD
CY2018Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	51367000	USD
CY2017Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	48751000	USD
CY2018Q4	rdn	Income Taxes Receivable Federal Current IncomeTaxesReceivableFederalCurrent	44506000	USD
CY2017Q4	rdn	Income Taxes Receivable Federal Current IncomeTaxesReceivableFederalCurrent	0	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	37090000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	38291000	USD
CY2018Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	34878000	USD
CY2017Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	31389000	USD
CY2018Q4	us-gaap	Securities Loaned Asset SecuritiesLoanedAsset	27860000	USD
CY2017Q4	us-gaap	Securities Loaned Asset SecuritiesLoanedAsset	27964000	USD
CY2018Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	19917000	USD
CY2017Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	22257000	USD
CY2018Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	17311000	USD
CY2017Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	16987000	USD
CY2018Q4	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	14402000	USD
CY2017Q4	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	8492000	USD
CY2018Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	36992000	USD
CY2017Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	39299000	USD
CY2018Q4	us-gaap	Other Assets OtherAssets	367700000	USD
CY2017Q4	us-gaap	Other Assets OtherAssets	407849000	USD
CY2017	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	10700000	USD
CY2016	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	6000000.0	USD
CY2018Q4	us-gaap	Capitalized Computer Software Accumulated Amortization CapitalizedComputerSoftwareAccumulatedAmortization	60300000	USD
CY2017Q4	us-gaap	Capitalized Computer Software Accumulated Amortization CapitalizedComputerSoftwareAccumulatedAmortization	48400000	USD
CY2018	us-gaap	Capitalized Computer Software Impairments1 CapitalizedComputerSoftwareImpairments1	5100000	USD
CY2018	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	11400000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	62900000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	57600000	USD
CY2018	us-gaap	Depreciation Depreciation	8000000.0	USD
CY2017	us-gaap	Depreciation Depreciation	6900000	USD
CY2016	us-gaap	Depreciation Depreciation	5600000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-42398000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	59122000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	4546000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	120573000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	166527000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	170887000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	78175000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	225649000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	175433000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	143679000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	121358000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	169290000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	0	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-96000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	9988000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5570000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-15641000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-8974000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-1856000	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	18197000	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	10663000	USD
CY2018	rdn	Effective Income Tax Rate Reconciliation Remeasurementof Net Dta Amount EffectiveIncomeTaxRateReconciliationRemeasurementofNetDTAAmount	0	USD
CY2017	rdn	Effective Income Tax Rate Reconciliation Remeasurementof Net Dta Amount EffectiveIncomeTaxRateReconciliationRemeasurementofNetDTAAmount	102617000	USD
CY2016	rdn	Effective Income Tax Rate Reconciliation Remeasurementof Net Dta Amount EffectiveIncomeTaxRateReconciliationRemeasurementofNetDTAAmount	0	USD
CY2018	rdn	Effective Income Taxrate Reconciliation Impactof Irs Settlement EffectiveIncomeTaxrateReconciliationImpactofIRSSettlement	-73585000	USD
CY2017	rdn	Effective Income Taxrate Reconciliation Impactof Irs Settlement EffectiveIncomeTaxrateReconciliationImpactofIRSSettlement	0	USD
CY2016	rdn	Effective Income Taxrate Reconciliation Impactof Irs Settlement EffectiveIncomeTaxrateReconciliationImpactofIRSSettlement	0	USD
CY2018	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	4367000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-786000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-5534000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	78175000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	225649000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	175433000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	17487000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	30267000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Unearned Premiums Reserve DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve	34686000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Unearned Premiums Reserve DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve	35035000	USD
CY2018Q4	rdn	Deferred Tax Liabilities Differences In Fv Of Derivative And Other Financial Instruments DeferredTaxLiabilitiesDifferencesInFvOfDerivativeAndOtherFinancialInstruments	-1115000	USD
CY2017Q4	rdn	Deferred Tax Liabilities Differences In Fv Of Derivative And Other Financial Instruments DeferredTaxLiabilitiesDifferencesInFvOfDerivativeAndOtherFinancialInstruments	0	USD
CY2018Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Trading Securities DeferredTaxAssetsUnrealizedLossesOnTradingSecurities	16297000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Trading Securities DeferredTaxAssetsUnrealizedLossesOnTradingSecurities	0	USD
CY2018Q4	rdn	Deferred Tax Assets Operating Loss Carryforwards Stateand Local Netof Federal Benefit DeferredTaxAssetsOperatingLossCarryforwardsStateandLocalNetofFederalBenefit	67069000	USD
CY2017Q4	rdn	Deferred Tax Assets Operating Loss Carryforwards Stateand Local Netof Federal Benefit DeferredTaxAssetsOperatingLossCarryforwardsStateandLocalNetofFederalBenefit	68577000	USD
CY2018Q4	rdn	Deferred Tax Asset Partnership Investments DeferredTaxAssetPartnershipInvestments	0	USD
CY2017Q4	rdn	Deferred Tax Asset Partnership Investments DeferredTaxAssetPartnershipInvestments	47991000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	1044000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	1397000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	0	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	57086000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	35068000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	36947000	USD
CY2018Q4	rdn	Deferred Tax Assets Deferred Policy Acquisitionand Ceding Commission Costs DeferredTaxAssetsDeferredPolicyAcquisitionandCedingCommissionCosts	15288000	USD
CY2017Q4	rdn	Deferred Tax Assets Deferred Policy Acquisitionand Ceding Commission Costs DeferredTaxAssetsDeferredPolicyAcquisitionandCedingCommissionCosts	14888000	USD
CY2018Q4	rdn	Deferred Tax Assets Share Based Compensation DeferredTaxAssetsShareBasedCompensation	10776000	USD
CY2017Q4	rdn	Deferred Tax Assets Share Based Compensation DeferredTaxAssetsShareBasedCompensation	10190000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	13091000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	16421000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	318799000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	211921000	USD
CY2018Q4	rdn	Deferred Tax Liabilities Equity Method Investments DeferredTaxLiabilitiesEquityMethodInvestments	639000	USD
CY2017Q4	rdn	Deferred Tax Liabilities Equity Method Investments DeferredTaxLiabilitiesEquityMethodInvestments	0	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Unrealized Gains On Trading Securities DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities	0	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Unrealized Gains On Trading Securities DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities	3833000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other Comprehensive Income DeferredTaxLiabilitiesOtherComprehensiveIncome	0	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other Comprehensive Income DeferredTaxLiabilitiesOtherComprehensiveIncome	6792000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	12201000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	11138000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	2942000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	2446000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	15782000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	24209000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	64496000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	65023000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	131643000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	229567000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2017	rdn	Effective Income Tax Rate Reconciliation Remeasurementof Net Dta Amount EffectiveIncomeTaxRateReconciliationRemeasurementofNetDTAAmount	102600000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2018Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	43800000	USD
CY2018Q4	rdn	Uncertain Tax Position Liability UncertainTaxPositionLiability	33600000	USD
CY2018Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	2200000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	67700000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	64500000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	65000000.0	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	16600000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	2200000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	1800000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	-61600000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	123951000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	123028000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	5058000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2343000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	26465000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	24122000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	43146000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1437000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	52353000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	26423000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	24105000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	33552000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	123951000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	-90400000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	43100000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	52400000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	26500000	USD
CY2018Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	401361000	USD
CY2017Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	507588000	USD
CY2018	us-gaap	Schedule Of Liability For Unpaid Claims And Claims Adjustment Expense ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense	the following table presents information relating to our mortgage insurance reserve for losses, including our IBNR reserve and LAE, but excluding our second-lien mortgage loan PDR:<div style="line-height:120%;text-align:left;padding-left:0px;text-indent:0px;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:86.93957115009746%;border-collapse:collapse;text-align:left;"><tr><td colspan="12"/></tr><tr><td style="width:60%;"/><td style="width:1%;"/><td style="width:10%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:10%;"/><td style="width:1%;"/><td style="width:3%;"/><td style="width:1%;"/><td style="width:10%;"/><td style="width:1%;"/></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="11" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:center;font-size:8pt;"><span style="font-family:inherit;font-size:8pt;font-weight:bold;">Year Ended December 31,</span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:8pt;"><span style="font-family:inherit;font-size:8pt;font-weight:bold;text-decoration:underline;">(In thousands)</span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#bec7cc;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="text-align:center;font-size:8pt;"><span style="font-family:inherit;font-size:8pt;font-weight:bold;">2018</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="text-align:center;font-size:8pt;"><span style="font-family:inherit;font-size:8pt;font-weight:bold;">2017</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="text-align:center;font-size:8pt;"><span style="font-family:inherit;font-size:8pt;font-weight:bold;">2016</span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;padding-left:12px;text-indent:-12px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Balance at January 1,</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#bec7cc;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;background-color:#bec7cc;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>507,588</span></span></div></td><td style="vertical-align:bottom;background-color:#bec7cc;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>760,269</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>976,399</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-left:12px;text-indent:-12px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Less: Reinsurance recoverables </span><span style="font-family:inherit;font-size:7pt;font-weight:bold;">(1)</span><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#bec7cc;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>8,350</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#bec7cc;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>6,851</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>8,286</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;padding-left:12px;text-indent:-12px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Balance at January 1, net of reinsurance recoverables</span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#bec7cc;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>499,238</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#bec7cc;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>753,418</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>968,113</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;padding-left:12px;text-indent:-12px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Add: Losses and LAE incurred in respect of default notices reported and unreported in:</span></div></td><td colspan="3" style="vertical-align:bottom;background-color:#bec7cc;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:28px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Current year </span><span style="font-family:inherit;font-size:7pt;font-weight:bold;">(2)</span><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;background-color:#bec7cc;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>135,291</span></span></div></td><td style="vertical-align:bottom;background-color:#bec7cc;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>185,486</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>206,383</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:28px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Prior years</span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#bec7cc;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>(31,699</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#bec7cc;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">)</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>(49,286</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">)</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>(3,516</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">)</span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Total incurred</span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#bec7cc;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>103,592</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#bec7cc;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>136,200</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>202,867</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Deduct: Paid claims and LAE related to:</span></div></td><td colspan="3" style="vertical-align:bottom;background-color:#bec7cc;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:28px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Current year </span><span style="font-family:inherit;font-size:7pt;font-weight:bold;">(2)</span><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;background-color:#bec7cc;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>5,856</span></span></div></td><td style="vertical-align:bottom;background-color:#bec7cc;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>25,011</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>11,410</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:28px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Prior years</span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#bec7cc;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>210,092</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#bec7cc;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>365,369</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>406,152</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;padding-left:12px;text-indent:-12px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Total paid</span></div></td><td colspan="2" style="vertical-align:bottom;background-color:#bec7cc;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>215,948</span></span></div></td><td style="vertical-align:bottom;background-color:#bec7cc;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>390,380</span></span></div></td><td style="vertical-align:bottom;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:7pt;"><span style="font-family:inherit;font-size:7pt;font-weight:bold;">(3)</span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>417,562</span></span></div></td><td style="vertical-align:bottom;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;padding-left:12px;text-indent:-12px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Balance at end of period, net of reinsurance recoverables</span></div></td><td colspan="2" style="vertical-align:bottom;background-color:#bec7cc;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>386,882</span></span></div></td><td style="vertical-align:bottom;background-color:#bec7cc;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>499,238</span></span></div></td><td style="vertical-align:bottom;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>753,418</span></span></div></td><td style="vertical-align:bottom;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-left:12px;text-indent:-12px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Add: reinsurance recoverables </span><span style="font-family:inherit;font-size:7pt;font-weight:bold;">(1)</span><span style="font-family:inherit;font-size:10pt;font-weight:bold;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#bec7cc;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>11,009</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#bec7cc;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>8,350</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>6,851</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;padding-left:12px;text-indent:-12px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Balance at December 31,</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#bec7cc;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#bec7cc;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>397,891</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#bec7cc;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>507,588</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><span>760,269</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr></table></div></div><div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">______________________</span></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:30px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:0px;"><span style="font-family:inherit;font-size:10pt;">(1)</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Related to ceded losses recoverable, if any, on reinsurance transactions, the QSR Program and the Single Premium QSR Program. See Note </span><span style="font-family:inherit;font-size:10pt;">8</span><span style="font-family:inherit;font-size:10pt;"> for additional information.</span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:30px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:0px;"><span style="font-family:inherit;font-size:10pt;">(2)</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Related to underlying defaulted loans with a most recent default notice dated in the year indicated. For example, if a loan had defaulted in a prior year, but then subsequently cured and later re-defaulted in the current year, that default</span></div></td></tr></table><div style="line-height:120%;padding-left:30px;"><span style="font-family:inherit;font-size:10pt;"> would be considered a current year default. For 2017, includes payments made on pool commutations, in some cases for loans not previously in default.</span></div><div style="line-height:120%;font-size:10pt;padding-left:0px;"><span style="font-family:inherit;font-size:10pt;">(3)</span></div><span style="font-family:inherit;font-size:10pt;">Includes the payment of </span><span style="font-family:inherit;font-size:10pt;"><span>$54.8 million</span></span> made in connection with the scheduled final settlement of the Freddie Mac Agreement in the third quarter of 2017.
CY2018Q4	rdn	Number Of Payments Missed For Insured Loans NumberOfPaymentsMissedForInsuredLoans	2	payment
CY2018Q4	us-gaap	Other Sundry Liabilities OtherSundryLiabilities	86576000	USD
CY2018Q4	rdn	Unearned Ceding Commissions UnearnedCedingCommissions	91400000	USD
CY2017Q4	rdn	Unearned Ceding Commissions UnearnedCedingCommissions	89907000	USD
CY2018Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	82532000	USD
CY2017Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	0	USD
CY2018Q4	us-gaap	Accrued Salaries Current And Noncurrent AccruedSalariesCurrentAndNoncurrent	61452000	USD
CY2017Q4	us-gaap	Accrued Salaries Current And Noncurrent AccruedSalariesCurrentAndNoncurrent	67687000	USD
CY2018Q4	rdn	Securities Lending Payable SecuritiesLendingPayable	11699000	USD
CY2017Q4	rdn	Securities Lending Payable SecuritiesLendingPayable	19357000	USD
CY2018Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	0	USD
CY2017Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	96740000	USD
CY2017Q4	us-gaap	Other Sundry Liabilities OtherSundryLiabilities	80154000	USD
CY2018Q4	us-gaap	Other Liabilities OtherLiabilities	333659000	USD
CY2017Q4	us-gaap	Other Liabilities OtherLiabilities	353845000	USD
CY2018Q4	rdn	Reserve For Contract Underwriting Obligations ReserveForContractUnderwritingObligations	200000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	9700000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	5700000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	5000000.0	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	11310000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	10847000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	10165000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	10100000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	10251000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	56317000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	108990000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals	0	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17649000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	13492000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	16304000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17649000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	13492000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	16304000	USD
CY2018	rdn	Share Based Compensation Arrangement Amount Deferred As Policy Acquisition Cost ShareBasedCompensationArrangementAmountDeferredAsPolicyAcquisitionCost	324000	USD
CY2017	rdn	Share Based Compensation Arrangement Amount Deferred As Policy Acquisition Cost ShareBasedCompensationArrangementAmountDeferredAsPolicyAcquisitionCost	269000	USD
CY2016	rdn	Share Based Compensation Arrangement Amount Deferred As Policy Acquisition Cost ShareBasedCompensationArrangementAmountDeferredAsPolicyAcquisitionCost	206000	USD
CY2018	rdn	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost Excluding Amounts Deferred As Policy Acquisition Costs Prior To Income Taxes ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostExcludingAmountsDeferredAsPolicyAcquisitionCostsPriorToIncomeTaxes	17325000	USD
CY2017	rdn	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost Excluding Amounts Deferred As Policy Acquisition Costs Prior To Income Taxes ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostExcludingAmountsDeferredAsPolicyAcquisitionCostsPriorToIncomeTaxes	13223000	USD
CY2016	rdn	Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost Excluding Amounts Deferred As Policy Acquisition Costs Prior To Income Taxes ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationCostExcludingAmountsDeferredAsPolicyAcquisitionCostsPriorToIncomeTaxes	16098000	USD
CY2018Q4	rdn	Restricted Net Assets Held By Consolidated Subsidiaries RestrictedNetAssetsHeldByConsolidatedSubsidiaries	3600000000	USD
CY2018Q4	rdn	Risk To Capital Ratio Regulatory Maximum RiskToCapitalRatioRegulatoryMaximum	25
CY2018Q4	rdn	Risk To Capital Ratio RiskToCapitalRatio	12.8
CY2017Q4	rdn	Risk To Capital Ratio RiskToCapitalRatio	12.1
CY2018Q4	rdn	Numberof Subsidiaries NumberofSubsidiaries	5	subsidiaries
CY2018Q4	rdn	Segregated Funds Heldfor Others SegregatedFundsHeldforOthers	4700000	USD
CY2018Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	242550000	USD
CY2018Q2	us-gaap	Premiums Earned Net PremiumsEarnedNet	251344000	USD
CY2018Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	258431000	USD
CY2018Q4	us-gaap	Premiums Earned Net PremiumsEarnedNet	261682000	USD
CY2018	us-gaap	Premiums Earned Net PremiumsEarnedNet	1014007000	USD
CY2018Q1	rdn	Services Revenue Net ServicesRevenueNet	33164000	USD
CY2018Q2	rdn	Services Revenue Net ServicesRevenueNet	36828000	USD
CY2018Q3	rdn	Services Revenue Net ServicesRevenueNet	36566000	USD
CY2018Q4	rdn	Services Revenue Net ServicesRevenueNet	38414000	USD
CY2018	rdn	Services Revenue Net ServicesRevenueNet	144972000	USD
CY2018Q1	us-gaap	Net Investment Income NetInvestmentIncome	33956000	USD
CY2018Q2	us-gaap	Net Investment Income NetInvestmentIncome	37473000	USD
CY2018Q3	us-gaap	Net Investment Income NetInvestmentIncome	38995000	USD
CY2018Q4	us-gaap	Net Investment Income NetInvestmentIncome	42051000	USD
CY2018	us-gaap	Net Investment Income NetInvestmentIncome	152475000	USD
CY2018Q1	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	-18887000	USD
CY2018Q2	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	-7404000	USD
CY2018Q3	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	-4480000	USD
CY2018Q4	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	-11705000	USD
CY2018	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	-42476000	USD
CY2018Q1	rdn	Policyholder Benefitsand Claims Incurred Netand Including Changein Reservesfor Premium Deficiency PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency	37283000	USD
CY2018Q2	rdn	Policyholder Benefitsand Claims Incurred Netand Including Changein Reservesfor Premium Deficiency PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency	19337000	USD
CY2018Q3	rdn	Policyholder Benefitsand Claims Incurred Netand Including Changein Reservesfor Premium Deficiency PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency	20881000	USD
CY2018Q4	rdn	Policyholder Benefitsand Claims Incurred Netand Including Changein Reservesfor Premium Deficiency PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency	27140000	USD
CY2018	rdn	Policyholder Benefitsand Claims Incurred Netand Including Changein Reservesfor Premium Deficiency PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency	104641000	USD
CY2018Q1	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	7117000	USD
CY2018Q2	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	5996000	USD
CY2018Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	5667000	USD
CY2018Q4	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	6485000	USD
CY2018	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	25265000	USD
CY2018Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	23126000	USD
CY2018Q2	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	24205000	USD
CY2018Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	25854000	USD
CY2018Q4	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	24939000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	98124000	USD
CY2018Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	63243000	USD
CY2018Q2	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	70184000	USD
CY2018Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	70125000	USD
CY2018Q4	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	77266000	USD
CY2018	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	280818000	USD
CY2018Q1	rdn	Restructuringand Other Exit Costs RestructuringandOtherExitCosts	551000	USD
CY2018Q2	rdn	Restructuringand Other Exit Costs RestructuringandOtherExitCosts	925000	USD
CY2018Q3	rdn	Restructuringand Other Exit Costs RestructuringandOtherExitCosts	4464000	USD
CY2018Q4	rdn	Restructuringand Other Exit Costs RestructuringandOtherExitCosts	113000	USD
CY2018	rdn	Restructuringand Other Exit Costs RestructuringandOtherExitCosts	6053000	USD
CY2018Q1	rdn	Increase Decreasein Goodwilland Intangible Assets IncreaseDecreaseinGoodwillandIntangibleAssets	2748000	USD
CY2018Q2	rdn	Increase Decreasein Goodwilland Intangible Assets IncreaseDecreaseinGoodwillandIntangibleAssets	2748000	USD
CY2018Q3	rdn	Increase Decreasein Goodwilland Intangible Assets IncreaseDecreaseinGoodwillandIntangibleAssets	3472000	USD
CY2018Q4	rdn	Increase Decreasein Goodwilland Intangible Assets IncreaseDecreaseinGoodwillandIntangibleAssets	3461000	USD
CY2018	rdn	Increase Decreasein Goodwilland Intangible Assets IncreaseDecreaseinGoodwillandIntangibleAssets	12429000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	114486000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	208949000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	142797000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	139779000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	606011000	USD
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.96
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.64
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.77
CY2018Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	219883000	shares
CY2018Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	217830000	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	217902000	shares
CY2018Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	217883000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	218553000	shares
CY2017Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	221800000	USD
CY2017Q2	us-gaap	Premiums Earned Net PremiumsEarnedNet	229096000	USD
CY2017Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	236702000	USD
CY2017Q4	us-gaap	Premiums Earned Net PremiumsEarnedNet	245175000	USD
CY2017	us-gaap	Premiums Earned Net PremiumsEarnedNet	932773000	USD
CY2017Q1	rdn	Services Revenue Net ServicesRevenueNet	38027000	USD
CY2017Q2	rdn	Services Revenue Net ServicesRevenueNet	37802000	USD
CY2017Q3	rdn	Services Revenue Net ServicesRevenueNet	39571000	USD
CY2017Q4	rdn	Services Revenue Net ServicesRevenueNet	39703000	USD
CY2017	rdn	Services Revenue Net ServicesRevenueNet	155103000	USD
CY2017Q1	us-gaap	Net Investment Income NetInvestmentIncome	31032000	USD
CY2017Q2	us-gaap	Net Investment Income NetInvestmentIncome	30071000	USD
CY2017Q3	us-gaap	Net Investment Income NetInvestmentIncome	32540000	USD
CY2017Q4	us-gaap	Net Investment Income NetInvestmentIncome	33605000	USD
CY2017	us-gaap	Net Investment Income NetInvestmentIncome	127248000	USD
CY2017Q1	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	-2851000	USD
CY2017Q2	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	5331000	USD
CY2017Q3	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	2480000	USD
CY2017Q4	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	-1339000	USD
CY2017	rdn	Net Gains Losseson Investmentsand Other Financial Instruments NetGainsLossesonInvestmentsandOtherFinancialInstruments	3621000	USD
CY2017Q1	rdn	Policyholder Benefitsand Claims Incurred Netand Including Changein Reservesfor Premium Deficiency PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency	46913000	USD
CY2017Q2	rdn	Policyholder Benefitsand Claims Incurred Netand Including Changein Reservesfor Premium Deficiency PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency	17222000	USD
CY2017Q3	rdn	Policyholder Benefitsand Claims Incurred Netand Including Changein Reservesfor Premium Deficiency PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency	35841000	USD
CY2017Q4	rdn	Policyholder Benefitsand Claims Incurred Netand Including Changein Reservesfor Premium Deficiency PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency	35178000	USD
CY2017	rdn	Policyholder Benefitsand Claims Incurred Netand Including Changein Reservesfor Premium Deficiency PolicyholderBenefitsandClaimsIncurredNetandIncludingChangeinReservesforPremiumDeficiency	135154000	USD
CY2017Q1	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	6729000	USD
CY2017Q2	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	6123000	USD
CY2017Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	5554000	USD
CY2017Q4	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	5871000	USD
CY2017	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	24277000	USD
CY2017Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	28375000	USD
CY2017Q2	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	25635000	USD
CY2017Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	27240000	USD
CY2017Q4	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	23349000	USD
CY2017	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	104599000	USD
CY2017Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	68377000	USD
CY2017Q2	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	68750000	USD
CY2017Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	64195000	USD
CY2017Q4	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	65999000	USD
CY2017	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	267321000	USD
CY2017Q1	rdn	Restructuringand Other Exit Costs RestructuringandOtherExitCosts	0	USD
CY2017Q2	rdn	Restructuringand Other Exit Costs RestructuringandOtherExitCosts	0	USD
CY2017Q3	rdn	Restructuringand Other Exit Costs RestructuringandOtherExitCosts	12038000	USD
CY2017Q4	rdn	Restructuringand Other Exit Costs RestructuringandOtherExitCosts	5230000	USD
CY2017	rdn	Restructuringand Other Exit Costs RestructuringandOtherExitCosts	17268000	USD
CY2017Q1	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-4456000	USD
CY2017Q2	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-1247000	USD
CY2017Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-45766000	USD
CY2017Q4	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-51469000	USD
CY2017Q1	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2017Q2	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	184374000	USD
CY2017Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2017Q4	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2017	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	184374000	USD
CY2017Q1	rdn	Increase Decreasein Goodwilland Intangible Assets IncreaseDecreaseinGoodwillandIntangibleAssets	3296000	USD
CY2017Q2	rdn	Increase Decreasein Goodwilland Intangible Assets IncreaseDecreaseinGoodwillandIntangibleAssets	18856000	USD
CY2017Q3	rdn	Increase Decreasein Goodwilland Intangible Assets IncreaseDecreaseinGoodwillandIntangibleAssets	2890000	USD
CY2017Q4	rdn	Increase Decreasein Goodwilland Intangible Assets IncreaseDecreaseinGoodwillandIntangibleAssets	2629000	USD
CY2017	rdn	Increase Decreasein Goodwilland Intangible Assets IncreaseDecreaseinGoodwillandIntangibleAssets	27671000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	76472000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	-27342000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	65142000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	6816000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	121088000	USD
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.13
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.30
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.03
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.55
CY2017Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	221497000	shares
CY2017Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	215152000	shares
CY2017Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	219391000	shares
CY2017Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	220250000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	220406000	shares
CY2018Q4	us-gaap	Summary Of Investments Other Than Investments In Related Parties Cost SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost	5264919000	USD
CY2018Q4	us-gaap	Summary Of Investments Other Than Investments In Related Parties Fair Value SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue	5180889000	USD
CY2018Q4	us-gaap	Summary Of Investments Other Than Investments In Related Parties Carrying Amount SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount	5180889000	USD
CY2018Q4	us-gaap	Securities Received As Collateral SecuritiesReceivedAsCollateral	11700000	USD
CY2018	us-gaap	Reductions In Other Assets Amount ReductionsInOtherAssetsAmount	107100000	USD
CY2018	us-gaap	Additions To Other Assets Amount AdditionsToOtherAssetsAmount	28700000	USD
CY2018	rdn	Total Operating Expenses Allocatedto Subsidiaries From Parent Company TotalOperatingExpensesAllocatedtoSubsidiariesFromParentCompany	94815000	USD
CY2017	rdn	Total Operating Expenses Allocatedto Subsidiaries From Parent Company TotalOperatingExpensesAllocatedtoSubsidiariesFromParentCompany	72764000	USD
CY2016	rdn	Total Operating Expenses Allocatedto Subsidiaries From Parent Company TotalOperatingExpensesAllocatedtoSubsidiariesFromParentCompany	56446000	USD
CY2018	rdn	Total Interest Expense Allocatedto Subsidiaries From Parent Company TotalInterestExpenseAllocatedtoSubsidiariesFromParentCompany	42195000	USD
CY2017	rdn	Total Interest Expense Allocatedto Subsidiaries From Parent Company TotalInterestExpenseAllocatedtoSubsidiariesFromParentCompany	44686000	USD
CY2016	rdn	Total Interest Expense Allocatedto Subsidiaries From Parent Company TotalInterestExpenseAllocatedtoSubsidiariesFromParentCompany	52092000	USD
CY2018Q4	rdn	Number Of Guaranteed Structured Transactions For Radian Guaranty NumberOfGuaranteedStructuredTransactionsForRadianGuaranty	2	transaction
CY2018	us-gaap	Direct Premiums Earned DirectPremiumsEarned	1074298000	USD
CY2018	us-gaap	Ceded Premiums Earned CededPremiumsEarned	67195000	USD
CY2018	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	6904000	USD
CY2018	us-gaap	Premiums Earned Net PremiumsEarnedNet	1014007000	USD
CY2018	us-gaap	Premiums Percentage Assumed To Net PremiumsPercentageAssumedToNet	0.0068
CY2017	us-gaap	Direct Premiums Earned DirectPremiumsEarned	990016000	USD
CY2017	us-gaap	Ceded Premiums Earned CededPremiumsEarned	57271000	USD
CY2017	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	28000	USD
CY2017	us-gaap	Premiums Earned Net PremiumsEarnedNet	932773000	USD
CY2017	us-gaap	Premiums Percentage Assumed To Net PremiumsPercentageAssumedToNet	0.0000
CY2016	us-gaap	Direct Premiums Earned DirectPremiumsEarned	999093000	USD
CY2016	us-gaap	Ceded Premiums Earned CededPremiumsEarned	77359000	USD
CY2016	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	35000	USD
CY2016	us-gaap	Premiums Earned Net PremiumsEarnedNet	921769000	USD
CY2016	us-gaap	Premiums Percentage Assumed To Net PremiumsPercentageAssumedToNet	0.0000

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$RDN
RADIAN GROUP INC Stock $rdn

2017 Q4 Form 10-K Financial Statement

#000089092619000009 Filed on February 28, 2019

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$RDN RADIAN GROUP INC Stock $rdn

2017 Q4 Form 10-K Financial Statement

#000089092619000009 Filed on February 28, 2019

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$RDN
RADIAN GROUP INC Stock $rdn