$RNR
RENAISSANCERE HOLDINGS LTD Stock $rnr

$rnr Overview Financials Valuation SEC Filings Company Website

2013 Q2 Form 10-Q Financial Statement

#000144530513001786 Filed on August 01, 2013

Income Statement

Concept	2013 Q2	2012 Q2
Revenue	$250.2M	$303.8M
YoY Change	-17.62%	8.13%
Cost Of Revenue	$104.0M	$49.55M
YoY Change	109.81%	-67.24%
Gross Profit	$146.3M	$254.2M
YoY Change	-42.46%	96.07%
Gross Profit Margin	58.45%	83.69%
Selling, General & Admin	$64.30M	$45.30M
YoY Change	41.94%	-2.16%
% of Gross Profit	43.96%	17.82%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$31.77M	$25.61M
YoY Change	24.05%	84.46%
% of Gross Profit	21.72%	10.07%
Operating Expenses	$42.79M	$120.5M
YoY Change	-64.49%	-43.03%
Operating Profit	$103.5M	$133.7M
YoY Change	-22.61%	-263.4%
Interest Expense	$4.300M	$5.716M
YoY Change	-24.77%	-0.24%
% of Operating Profit	4.16%	4.27%
Other Income/Expense, Net
YoY Change
Pretax Income	$45.89M	$177.5M
YoY Change	-74.15%	178.5%
Income Tax	$11.00K	$899.0K
% Of Pretax Income	0.02%	0.51%
Net Earnings	$34.29M	$151.0M
YoY Change	-77.3%	350.62%
Net Earnings / Revenue	13.7%	49.71%
Basic Earnings Per Share	$0.61	$2.78
Diluted Earnings Per Share	$0.60	$2.75
COMMON SHARES
Basic Shares Outstanding	43.37M shares	50.28M shares
Diluted Shares Outstanding	44.24M shares	51.01M shares

Balance Sheet

Concept	2013 Q2	2012 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$234.9M	$264.2M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$312.0M	$312.0M
YoY Change	0.0%	21.4%
LONG-TERM ASSETS
Property, Plant & Equipment
YoY Change
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$93.05M	$79.69M
YoY Change	16.76%	-98.62%
Other Assets
YoY Change
Total Long-Term Assets	$8.155B	$8.648B
YoY Change	-5.69%	9.34%
TOTAL ASSETS
Total Short-Term Assets	$312.0M	$312.0M
Total Long-Term Assets	$8.155B	$8.648B
Total Assets	$8.467B	$8.960B
YoY Change	-5.49%	9.72%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$464.0M	$520.0M
YoY Change	-10.77%	404.85%
LONG-TERM LIABILITIES
Long-Term Debt	$250.0M	$354.0M
YoY Change	-29.38%	1.43%
Other Long-Term Liabilities	$216.0M	$175.0M
YoY Change	23.43%	7.36%
Total Long-Term Liabilities	$466.0M	$529.0M
YoY Change	-11.91%	3.32%
TOTAL LIABILITIES
Total Short-Term Liabilities	$464.0M	$520.0M
Total Long-Term Liabilities	$466.0M	$529.0M
Total Liabilities	$3.998B	$4.212B
YoY Change	-5.07%	-9.44%
SHAREHOLDERS EQUITY
Retained Earnings	$3.119B	$3.230B
YoY Change	-3.43%
Common Stock	$44.39M	$50.61M
YoY Change	-12.3%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$3.568B	$3.843B
YoY Change
Total Liabilities & Shareholders Equity	$8.467B	$8.960B
YoY Change	-5.49%	9.72%

Cashflow Statement

Concept	2013 Q2	2012 Q2
OPERATING ACTIVITIES
Net Income	$34.29M	$151.0M
YoY Change	-77.3%	350.62%
Depreciation, Depletion And Amortization	$31.77M	$25.61M
YoY Change	24.05%	84.46%
Cash From Operating Activities	$48.90M	$132.7M
YoY Change	-63.15%	255.76%
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions
YoY Change
Other Investing Activities	-$60.80M	-$90.60M
YoY Change	-32.89%	-189.26%
Cash From Investing Activities	-$60.80M	-$90.60M
YoY Change	-32.89%	-189.26%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-35.30M	-36.30M
YoY Change	-2.75%	-76.54%
NET CHANGE
Cash From Operating Activities	48.90M	132.7M
Cash From Investing Activities	-60.80M	-90.60M
Cash From Financing Activities	-35.30M	-36.30M
Net Change In Cash	-47.20M	5.800M
YoY Change	-913.79%	-136.48%
FREE CASH FLOW
Cash From Operating Activities	$48.90M	$132.7M
Capital Expenditures
Free Cash Flow
YoY Change

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	7180000	USD
	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	2049000	USD
CY2013Q2	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	26658000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	541000	USD
CY2013Q2	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	647000	USD
CY2012Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	33478000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	13622000	USD
CY2013Q2	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	4909000	USD
CY2013Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	6050000	USD
CY2013Q2	us-gaap	Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities	849000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities	920000	USD
CY2013Q2	us-gaap	Alternative Investments Fair Value Disclosure AlternativeInvestmentsFairValueDisclosure	548354000	USD
CY2013Q2	us-gaap	Assets Assets	8467383000	USD
CY2012Q4	us-gaap	Assets Assets	7928628000	USD
CY2013Q2	us-gaap	Assets Held By Insurance Regulators AssetsHeldByInsuranceRegulators	644300000	USD
CY2013Q2	us-gaap	Assets Held In Trust AssetsHeldInTrust	1653700000	USD
CY2012Q2	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	655600000	USD
	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	1311288000	USD
CY2013Q2	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	686890000	USD
	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	1311991000	USD
CY2012Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	71445000	USD
CY2013Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	36094000	USD
CY2013Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	1265000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	1139000	USD
CY2013Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	1084000	USD
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	598000	USD
CY2013Q2	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	181000	USD
CY2013Q2	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	677000	USD
CY2013Q2	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	1660000	USD
CY2013Q2	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	1839000	USD
CY2013Q2	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	539000	USD
CY2013Q2	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	649000	USD
CY2013Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	0	USD
CY2013Q2	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	0	USD
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CY2012Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	103000	USD
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CY2013Q2	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	49000	USD
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CY2013Q2	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses2	67000	USD
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CY2013Q2	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses2	18000	USD
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CY2012Q2	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	746000	USD
CY2013Q2	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	4758000	USD
CY2012Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	12100000	USD
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	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	218924000	USD
CY2012Q2	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	126349000	USD
	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	312273000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	325358000	USD
CY2013Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	285594000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	216984000	USD
CY2012Q2	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	264232000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-39764000	USD
	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	47248000	USD
	us-gaap	Ceded Premiums Written CededPremiumsWritten	411282000	USD
	us-gaap	Ceded Premiums Written CededPremiumsWritten	342719000	USD
CY2012Q2	us-gaap	Ceded Premiums Written CededPremiumsWritten	239706000	USD
CY2013Q2	us-gaap	Ceded Premiums Written CededPremiumsWritten	144114000	USD
CY2013Q2	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.27
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.56
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.54
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CY2013Q2	us-gaap	Common Stock Value CommonStockValue	44385000	USD
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	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	361970000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	222325000	USD
CY2012Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	150563000	USD
CY2013Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	33148000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	52622000	USD
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	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	56776000	USD
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	49719000	USD
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	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	28785000	USD
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	26721000	USD
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CY2013Q2	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	2712000	USD
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CY2013Q2	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	467000	USD
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CY2012Q2	us-gaap	Derivative Instruments Gain Loss Recognized In Income Net DerivativeInstrumentsGainLossRecognizedInIncomeNet	9208000	USD
CY2013Q2	us-gaap	Derivative Liabilities DerivativeLiabilities	25698000	USD
CY2012Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	19258000	USD
CY2013Q2	us-gaap	Due To Affiliate Current And Noncurrent DueToAffiliateCurrentAndNoncurrent	0	USD
	us-gaap	Description Of New Accounting Pronouncements Not Yet Adopted DescriptionOfNewAccountingPronouncementsNotYetAdopted	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:16px;text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS NOT YET ADOPTED</font></div><div style="line-height:120%;padding-top:16px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;font-style:italic;">Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists </font></div><div style="line-height:120%;padding-top:8px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">In July 2013, the FASB issued ASU No. 2013-11, </font><font style="font-family:Arial;font-size:10pt;font-style:italic;">Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists </font><font style="font-family:Arial;font-size:10pt;">("ASU 2013-11"). The objective of ASU 2013-11 is to improve the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. ASU 2013-11 seeks to reduce the diversity in practice by providing guidance on the presentation of unrecognized tax benefits to better reflect the manner in which an entity would settle at the reporting date any additional income taxes that would result from the disallowance of a tax position when net operating loss carryforwards, similar tax losses, or tax credit carryforwards exist. ASU 2013-11 is effective for annual and interim reporting periods beginning after December 15, 2013, with both early adoption and retrospective application permitted. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact </font></div></div>
	us-gaap	Direct Premiums Written DirectPremiumsWritten	20199000	USD
CY2013Q2	us-gaap	Direct Premiums Written DirectPremiumsWritten	16333000	USD
	us-gaap	Direct Premiums Written DirectPremiumsWritten	26650000	USD
CY2012Q2	us-gaap	Direct Premiums Written DirectPremiumsWritten	11736000	USD
	us-gaap	Dividends Common Stock DividendsCommonStock	27673000	USD
	us-gaap	Dividends Common Stock DividendsCommonStock	24658000	USD
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	17500000	USD
	us-gaap	Dividends Preferred Stock DividendsPreferredStock	13758000	USD
CY2013Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7483000	USD
CY2012Q2	us-gaap	Dividends Preferred Stock DividendsPreferredStock	8750000	USD
CY2013Q2	us-gaap	Due From Affiliates DueFromAffiliates	0	USD
CY2012Q4	us-gaap	Due From Affiliates DueFromAffiliates	0	USD
CY2012Q4	us-gaap	Due To Affiliate Current And Noncurrent DueToAffiliateCurrentAndNoncurrent	0	USD
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.72
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.93
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.78
CY2013Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.61
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.75
CY2013Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.60
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.63
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.83
	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-1559000	USD
	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	505000	USD
CY2012Q4	us-gaap	Equity Method Investments EquityMethodInvestments	87724000	USD
CY2013Q2	us-gaap	Equity Method Investments EquityMethodInvestments	93049000	USD
	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Investment Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInInvestmentIncome	16108000	USD
	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Investment Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInInvestmentIncome	11032000	USD
CY2012Q2	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Investment Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInInvestmentIncome	-13076000	USD
CY2013Q2	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Investment Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInInvestmentIncome	-2259000	USD
	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Other Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInOtherIncome	9678000	USD
	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Other Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInOtherIncome	2088000	USD
CY2012Q2	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Other Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInOtherIncome	8019000	USD
CY2013Q2	us-gaap	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Other Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInOtherIncome	3392000	USD
CY2013Q2	us-gaap	Fair Value Investments Entities That Calculate Net Asset Value Per Share Unfunded Committments FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments	111321000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	68804000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	42460000	USD
CY2012Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	46834000	USD
CY2013Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	31675000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	105086000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	-50483000	USD
CY2012Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	91655000	USD
CY2013Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales	-50483000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	-50741000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	140199000	USD
CY2012Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	-10365000	USD
CY2013Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	117902000	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	0	USD
	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	0	USD
CY2012Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	0	USD
CY2011Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	452813000	USD
CY2012Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	452465000	USD
CY2012Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	434799000	USD
CY2013Q2	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	421853000	USD
CY2012Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	494520000	USD
CY2013Q1	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	451601000	USD
CY2013Q2	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-1085000	USD
CY2012Q2	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	2410000	USD
	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	671000	USD
	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	950000	USD
CY2012Q2	us-gaap	Gain Loss On Investments GainLossOnInvestments	28073000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	75681000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	-55273000	USD
CY2013Q2	us-gaap	Gain Loss On Investments GainLossOnInvestments	-69544000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	26117000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	8878000	USD
CY2012Q2	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	4067000	USD
CY2013Q2	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	21588000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	284029000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	448105000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	184149000	USD
CY2013Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	48551000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	284029000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	448105000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	184149000	USD
CY2013Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	48551000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	447244000	USD
CY2013Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	48304000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	283660000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	183251000	USD
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	6.70
CY2013Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.61
CY2012Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.75
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	4.93
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	6.61
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	4.83
CY2012Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.72
CY2013Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.60
	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	1220000	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2013Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	1393000	USD
CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.03
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.02
CY2013Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2013Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.03
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.02
CY2012Q2	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	6846000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	12316000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	9607000	USD
CY2013Q2	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	3772000	USD
	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	8868000	USD
	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	6468000	USD
CY2012Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	898000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	861000	USD
CY2013Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	247000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	369000	USD
	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	73060000	USD
	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	62306000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	24401000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	53425000	USD
	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	499668000	USD
	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	462777000	USD
	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	137722000	USD
	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	219720000	USD
	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	139786000	USD
	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	97006000	USD
	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	-17409000	USD
	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	-205252000	USD
	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	616844000	USD
	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	570500000	USD
CY2013Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	871000	shares
CY2012Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	734000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	669000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	850000	shares
CY2012Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	8486000	USD
CY2013Q2	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	8282000	USD
	us-gaap	Interest Expense InterestExpense	9334000	USD
CY2012Q2	us-gaap	Interest Expense InterestExpense	5716000	USD
CY2013Q2	us-gaap	Interest Expense InterestExpense	4300000	USD
	us-gaap	Interest Expense InterestExpense	11434000	USD
	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	5776000	USD
	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	5425000	USD
CY2013Q2	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	2836000	USD
CY2012Q2	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	2724000	USD
CY2012Q4	us-gaap	Investments Investments	6360647000	USD
CY2013Q2	us-gaap	Investments Investments	6169209000	USD
CY2013Q2	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	0	USD
CY2012Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	0	USD
CY2013Q2	us-gaap	Liabilities Liabilities	3998270000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	3453313000	USD
CY2013Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	8467383000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7928628000	USD
CY2012Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1879377000	USD
CY2013Q2	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1710408000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims	131213000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims	65103000	USD
CY2013Q2	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims	103962000	USD
CY2012Q2	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims	49551000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear	195689000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear	166421000	USD
CY2013Q2	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear	130789000	USD
CY2012Q2	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear	94997000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears	-64476000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears	-101318000	USD
CY2013Q2	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears	-26827000	USD
CY2012Q2	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears	-45446000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Period Increase Decrease LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePeriodIncreaseDecrease	168969000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Period Increase Decrease LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePeriodIncreaseDecrease	191107000	USD
CY2012Q4	us-gaap	Marketable Securities Fixed Maturities MarketableSecuritiesFixedMaturities	4748863000	USD
CY2013Q2	us-gaap	Marketable Securities Fixed Maturities MarketableSecuritiesFixedMaturities	4412091000	USD
CY2012Q4	us-gaap	Minority Interest MinorityInterest	3991000	USD
CY2013Q2	us-gaap	Minority Interest MinorityInterest	3693000	USD
	us-gaap	Minority Interest In Net Income Loss Other Minority Interests MinorityInterestInNetIncomeLossOtherMinorityInterests	52622000	USD
CY2012Q2	us-gaap	Minority Interest In Net Income Loss Other Minority Interests MinorityInterestInNetIncomeLossOtherMinorityInterests	33624000	USD
	us-gaap	Minority Interest In Net Income Loss Other Minority Interests MinorityInterestInNetIncomeLossOtherMinorityInterests	87265000	USD
CY2013Q2	us-gaap	Minority Interest In Net Income Loss Other Minority Interests MinorityInterestInNetIncomeLossOtherMinorityInterests	14015000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	25580000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-376800000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-280550000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	159112000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	177419000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	303777000	USD
	us-gaap	Net Income Loss NetIncomeLoss	231038000	USD
CY2013Q2	us-gaap	Net Income Loss NetIncomeLoss	34289000	USD
	us-gaap	Net Income Loss NetIncomeLoss	361199000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	151020000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	87265000	USD
CY2013Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	14015000	USD
CY2012Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	33624000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	52622000	USD
CY2013Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	26806000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	217280000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	343699000	USD
CY2012Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	142270000	USD
	us-gaap	Net Investment Income NetInvestmentIncome	83149000	USD
CY2012Q2	us-gaap	Net Investment Income NetInvestmentIncome	17673000	USD
	us-gaap	Net Investment Income NetInvestmentIncome	70518000	USD
CY2013Q2	us-gaap	Net Investment Income NetInvestmentIncome	27324000	USD
CY2013Q2	us-gaap	Notes And Loans Payable NotesAndLoansPayable	250411000	USD
CY2012Q4	us-gaap	Notes And Loans Payable NotesAndLoansPayable	351775000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segments
CY2013Q2	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	49	states
CY2012Q4	us-gaap	Other Assets OtherAssets	218405000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	8713000	USD
CY2013Q2	us-gaap	Other Assets OtherAssets	196126000	USD
CY2013Q2	us-gaap	Other Assets Fair Value Disclosure OtherAssetsFairValueDisclosure	625000	USD
CY2012Q4	us-gaap	Other Assets Fair Value Disclosure OtherAssetsFairValueDisclosure	21513000	USD
CY2012Q2	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	432000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-823000	USD
CY2013Q2	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	1141000	USD
	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-7180000	USD
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	0	USD
CY2013Q2	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-1319000	USD
CY2013Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-1141000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	823000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-8713000	USD
CY2012Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-432000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	83790000	USD
	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	88833000	USD
CY2013Q2	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	42819000	USD
CY2012Q2	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	41407000	USD
CY2013Q2	us-gaap	Other Investments OtherInvestments	630606000	USD
CY2012Q4	us-gaap	Other Investments OtherInvestments	644711000	USD
CY2013Q2	us-gaap	Other Liabilities OtherLiabilities	216086000	USD
CY2012Q4	us-gaap	Other Liabilities OtherLiabilities	253438000	USD
CY2013Q2	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	631000	USD
	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	7635000	USD
	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-27805000	USD
CY2012Q2	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	11289000	USD
CY2013Q2	us-gaap	Other Short Term Investments OtherShortTermInvestments	924843000	USD
CY2012Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	821163000	USD
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	110000	USD
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	0	USD
CY2013Q2	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	0	USD
CY2012Q2	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	44000	USD
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	8000	USD
CY2012Q2	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	8000	USD
CY2013Q2	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	0	USD
CY2012Q2	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	1404000	USD
CY2011Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	2370000	USD
CY2013Q2	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	791000	USD
CY2012Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	838000	USD
CY2012Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	2188000	USD
CY2013Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	811000	USD
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Cash Flows OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows	0	USD
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Cash Flows OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows	0	USD
CY2012Q2	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Cash Flows OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows	0	USD
CY2013Q2	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Cash Flows OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows	0	USD
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Change In Status OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsChangeInStatus	0	USD
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Change In Status OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsChangeInStatus	0	USD
CY2012Q2	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Change In Status OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsChangeInStatus	0	USD
CY2013Q2	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Change In Status OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsChangeInStatus	0	USD
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	1084000	USD
	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	47000	USD
CY2013Q2	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	20000	USD
CY2012Q2	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	836000	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	395000	USD
CY2013Q2	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	0	USD
CY2012Q2	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	234000	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	0	USD
CY2013Q2	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	0	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	0	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	52000	USD
CY2012Q2	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	25000	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities	0	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities	343000	USD
CY2013Q2	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities	0	USD
CY2012Q2	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities	209000	USD
CY2013Q2	us-gaap	Payables To Broker Dealers And Clearing Organizations PayablesToBrokerDealersAndClearingOrganizations	463923000	USD
CY2012Q4	us-gaap	Payables To Broker Dealers And Clearing Organizations PayablesToBrokerDealersAndClearingOrganizations	278787000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-598000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	166000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	121996000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	90111000	USD
	us-gaap	Payments For Repurchase Of Preferred Stock And Preference Stock PaymentsForRepurchaseOfPreferredStockAndPreferenceStock	125000000	USD
	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	-160864000	USD
	us-gaap	Payments For Repurchase Of Redeemable Noncontrolling Interest PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	113633000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	24658000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	27673000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	17500000	USD
	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	13758000	USD
	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	USD
	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	2500000	USD
	us-gaap	Payments To Acquire Trading Securities Heldforinvestment PaymentsToAcquireTradingSecuritiesHeldforinvestment	5312902000	USD
	us-gaap	Payments To Acquire Trading Securities Heldforinvestment PaymentsToAcquireTradingSecuritiesHeldforinvestment	4225188000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	150993000	USD
CY2013Q2	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	116995000	USD
CY2012Q2	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	70101000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	85383000	USD
CY2012Q2	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	49551000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	65103000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	131213000	USD
CY2013Q2	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	103962000	USD
CY2012Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2013Q2	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2012Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	16000000	shares
CY2013Q2	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	16000000	shares
CY2013Q2	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	16000000	shares
CY2012Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	16000000	shares
CY2012Q4	us-gaap	Preferred Stock Value PreferredStockValue	400000000	USD
CY2013Q2	us-gaap	Preferred Stock Value PreferredStockValue	400000000	USD
CY2013Q2	us-gaap	Premiums Earned Net PremiumsEarnedNet	291889000	USD
	rnr	Underwriting Expense Ratio UnderwritingExpenseRatio	0.259
	us-gaap	Premiums Earned Net PremiumsEarnedNet	563144000	USD
CY2012Q2	us-gaap	Premiums Earned Net PremiumsEarnedNet	244416000	USD
	us-gaap	Premiums Earned Net PremiumsEarnedNet	523081000	USD
CY2013Q2	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	954142000	USD
CY2012Q4	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	491365000	USD
CY2012Q2	us-gaap	Premiums Written Net PremiumsWrittenNet	427630000	USD
	us-gaap	Premiums Written Net PremiumsWrittenNet	995922000	USD
	us-gaap	Premiums Written Net PremiumsWrittenNet	920205000	USD
CY2013Q2	us-gaap	Premiums Written Net PremiumsWrittenNet	559109000	USD
CY2013Q2	us-gaap	Prepaid Reinsurance Premiums PrepaidReinsurancePremiums	214804000	USD
CY2012Q4	us-gaap	Prepaid Reinsurance Premiums PrepaidReinsurancePremiums	77082000	USD
	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	0	USD
	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	0	USD
	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	0	USD
	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	8000000	USD
	us-gaap	Proceeds From Payments For Trading Securities ProceedsFromPaymentsForTradingSecurities	-35958000	USD
	us-gaap	Proceeds From Payments For Trading Securities ProceedsFromPaymentsForTradingSecurities	0	USD
	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	-101410000	USD
	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	0	USD
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	37530000	USD
	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	41338000	USD
	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	42935000	USD
	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	18681000	USD
	us-gaap	Proceeds From Sale And Maturity Of Trading Securities Heldforinvestment ProceedsFromSaleAndMaturityOfTradingSecuritiesHeldforinvestment	4792702000	USD
	us-gaap	Proceeds From Sale And Maturity Of Trading Securities Heldforinvestment ProceedsFromSaleAndMaturityOfTradingSecuritiesHeldforinvestment	4448449000	USD
CY2012Q2	us-gaap	Profit Loss ProfitLoss	184644000	USD
	us-gaap	Profit Loss ProfitLoss	283660000	USD
CY2013Q2	us-gaap	Profit Loss ProfitLoss	48304000	USD
	us-gaap	Profit Loss ProfitLoss	448464000	USD
CY2013Q2	us-gaap	Receivables From Brokers Dealers And Clearing Organizations ReceivablesFromBrokersDealersAndClearingOrganizations	311783000	USD
CY2012Q4	us-gaap	Receivables From Brokers Dealers And Clearing Organizations ReceivablesFromBrokersDealersAndClearingOrganizations	168673000	USD
CY2012Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	968259000	USD
CY2013Q2	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	897123000	USD
CY2012Q2	us-gaap	Reinsurance Costs And Recoveries Net ReinsuranceCostsAndRecoveriesNet	20550000	USD
CY2013Q2	us-gaap	Reinsurance Costs And Recoveries Net ReinsuranceCostsAndRecoveriesNet	13033000	USD
CY2013Q2	us-gaap	Securities For Reverse Repurchase Agreements SecuritiesForReverseRepurchaseAgreements	122500000	USD
CY2012Q4	us-gaap	Securities For Reverse Repurchase Agreements SecuritiesForReverseRepurchaseAgreements	74800000	USD
	us-gaap	Reinsurance Costs And Recoveries Net ReinsuranceCostsAndRecoveriesNet	19780000	USD
	us-gaap	Reinsurance Costs And Recoveries Net ReinsuranceCostsAndRecoveriesNet	20280000	USD
CY2012Q4	us-gaap	Reinsurance Payable ReinsurancePayable	290419000	USD
CY2013Q2	us-gaap	Reinsurance Payable ReinsurancePayable	387425000	USD
CY2013Q2	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	175103000	USD
CY2012Q4	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	192512000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3043901000	USD
CY2013Q2	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3119003000	USD
CY2013Q2	us-gaap	Revenues Revenues	252987000	USD
	us-gaap	Revenues Revenues	667029000	USD
CY2012Q2	us-gaap	Revenues Revenues	310498000	USD
	us-gaap	Revenues Revenues	596302000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	3503065000	USD
CY2013Q2	us-gaap	Stockholders Equity StockholdersEquity	3568297000	USD
CY2013Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3571990000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3507056000	USD
CY2012Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3846921000	USD
CY2013Q2	us-gaap	Trading Securities TradingSecurities	4371306000	USD
	us-gaap	Unrealized Gain Loss On Securities UnrealizedGainLossOnSecurities	2987000	USD
	us-gaap	Unrealized Gain Loss On Securities UnrealizedGainLossOnSecurities	-11206000	USD
CY2013Q2	us-gaap	Trading Securities Cost TradingSecuritiesCost	4388031000	USD
CY2012Q4	us-gaap	Trading Securities Cost TradingSecuritiesCost	4554362000	USD
CY2012Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	4665421000	USD
CY2013Q2	us-gaap	Trading Securities Debt TradingSecuritiesDebt	4371306000	USD
CY2013Q2	us-gaap	Trading Securities Equity TradingSecuritiesEquity	108620000	USD
CY2012Q4	us-gaap	Trading Securities Equity TradingSecuritiesEquity	58186000	USD
	us-gaap	Undistributed Earnings UndistributedEarnings	214106000	USD
CY2013Q2	us-gaap	Undistributed Earnings UndistributedEarnings	26430000	USD
	us-gaap	Undistributed Earnings UndistributedEarnings	338098000	USD
CY2012Q2	us-gaap	Undistributed Earnings UndistributedEarnings	140034000	USD
	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	5601000	USD
CY2012Q2	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	2236000	USD
	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	3174000	USD
CY2013Q2	us-gaap	Undistributed Earnings Allocated To Participating Securities UndistributedEarningsAllocatedToParticipatingSecurities	376000	USD
CY2013Q2	us-gaap	Unearned Premiums UnearnedPremiums	970017000	USD
CY2012Q4	us-gaap	Unearned Premiums UnearnedPremiums	399517000	USD
	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	21935000	USD
	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	10959000	USD
	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:16px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">USE OF ESTIMATES IN FINANCIAL STATEMENTS</font></div><div style="line-height:120%;padding-top:8px;text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported and disclosed amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates. The major estimates reflected in the Company's consolidated financial statements include, but are not limited to, the reserve for claims and claim expenses; reinsurance recoverables, including allowances for reinsurance recoverables deemed uncollectible; estimates of written and earned premiums; fair value, including the fair value of investments, financial instruments and derivatives; impairment charges and the Company's deferred tax valuation allowance.</font></div></div>
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	50997000	shares
CY2013Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	44243000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	44303000	shares
CY2012Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	51012000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	50328000	shares
CY2012Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	50278000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	43453000	shares
CY2013Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	43372000	shares
CY2012Q2	rnr	Assumed Premiums Earned AssumedPremiumsEarned	341620000	USD
CY2013Q2	rnr	Assumed Premiums Earned AssumedPremiumsEarned	380626000	USD
	rnr	Assumed Premiums Earned AssumedPremiumsEarned	698906000	USD
	rnr	Assumed Premiums Earned AssumedPremiumsEarned	747479000	USD
CY2013Q2	rnr	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLonger	6	securities
CY2012Q4	rnr	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLonger	11	securities
	rnr	Ceded Premiums Earned CededPremiumsEarned	204997000	USD
	rnr	Ceded Premiums Earned CededPremiumsEarned	191562000	USD
CY2013Q2	rnr	Ceded Premiums Earned CededPremiumsEarned	99526000	USD
CY2012Q2	rnr	Ceded Premiums Earned CededPremiumsEarned	105154000	USD
CY2012Q2	rnr	Change In Unearned Premium Net ChangeInUnearnedPremiumNet	-183214000	USD
	rnr	Change In Unearned Premium Net ChangeInUnearnedPremiumNet	-432778000	USD
	rnr	Change In Unearned Premium Net ChangeInUnearnedPremiumNet	-397124000	USD
CY2013Q2	rnr	Change In Unearned Premium Net ChangeInUnearnedPremiumNet	-267220000	USD
	rnr	Combined Ratio CombinedRatio	0.492
	rnr	Combined Ratio CombinedRatio	0.380
CY2013Q2	rnr	Combined Ratio CombinedRatio	0.612
CY2012Q2	rnr	Combined Ratio CombinedRatio	0.477
	rnr	Contributions To Subsidiaries ContributionsToSubsidiaries	0	USD
	rnr	Contributions To Subsidiaries ContributionsToSubsidiaries	0	USD
CY2013Q2	rnr	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	13176000	USD
CY2012Q4	rnr	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	16001000	USD
CY2013Q2	rnr	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	7867000	USD
CY2012Q4	rnr	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	19213000	USD
CY2012Q2	rnr	Direct Premiums Earned DirectPremiumsEarned	7950000	USD
CY2013Q2	rnr	Direct Premiums Earned DirectPremiumsEarned	10789000	USD
	rnr	Direct Premiums Earned DirectPremiumsEarned	20662000	USD
	rnr	Direct Premiums Earned DirectPremiumsEarned	15737000	USD
	rnr	Due To From Subsidiary DueToFromSubsidiary	0	USD
	rnr	Due To From Subsidiary DueToFromSubsidiary	0	USD
	rnr	Equity In Net Income Loss Of Subsidiaries EquityInNetIncomeLossOfSubsidiaries	0	USD
	rnr	Equity In Net Income Loss Of Subsidiaries EquityInNetIncomeLossOfSubsidiaries	0	USD
CY2012Q2	rnr	Equity In Net Income Loss Of Subsidiaries EquityInNetIncomeLossOfSubsidiaries	0	USD
CY2013Q2	rnr	Equity In Net Income Loss Of Subsidiaries EquityInNetIncomeLossOfSubsidiaries	0	USD
	rnr	Estimated Liquidation Period Of Limited Partnership Assets Maximum EstimatedLiquidationPeriodOfLimitedPartnershipAssetsMaximum	10
	rnr	Estimated Liquidation Period Of Limited Partnership Assets Minimum EstimatedLiquidationPeriodOfLimitedPartnershipAssetsMinimum	7
	rnr	Fair Value Assets And Liabilities Measured On Recurring Basis Foreign Exchange Gains Losses FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses	-670000	USD
	rnr	Fair Value Assets And Liabilities Measured On Recurring Basis Foreign Exchange Gains Losses FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses	-128000	USD
CY2012Q2	rnr	Fair Value Assets And Liabilities Measured On Recurring Basis Foreign Exchange Gains Losses FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses	-1023000	USD
CY2013Q2	rnr	Fair Value Assets And Liabilities Measured On Recurring Basis Foreign Exchange Gains Losses FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses	733000	USD
	rnr	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss During Period Included In Investment Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome	16108000	USD
	rnr	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss During Period Included In Investment Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome	11032000	USD
CY2012Q2	rnr	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss During Period Included In Investment Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome	-13076000	USD
CY2013Q2	rnr	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss During Period Included In Investment Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome	-2259000	USD
	rnr	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss During Period Included In Other Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInOtherIncome	2987000	USD
	rnr	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss During Period Included In Other Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInOtherIncome	-11206000	USD
CY2012Q2	rnr	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss During Period Included In Other Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInOtherIncome	-15576000	USD
CY2013Q2	rnr	Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss During Period Included In Other Income FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInOtherIncome	-20982000	USD
	rnr	Fair Value Assets Measured On Recurring Basis Realized Gain Loss During Period Included In Other Income FairValueAssetsMeasuredOnRecurringBasisRealizedGainLossDuringPeriodIncludedInOtherIncome	-33232000	USD
	rnr	Fair Value Assets Measured On Recurring Basis Realized Gain Loss During Period Included In Other Income FairValueAssetsMeasuredOnRecurringBasisRealizedGainLossDuringPeriodIncludedInOtherIncome	34612000	USD
CY2012Q2	rnr	Fair Value Assets Measured On Recurring Basis Realized Gain Loss During Period Included In Other Income FairValueAssetsMeasuredOnRecurringBasisRealizedGainLossDuringPeriodIncludedInOtherIncome	22076000	USD
CY2013Q2	rnr	Fair Value Assets Measured On Recurring Basis Realized Gain Loss During Period Included In Other Income FairValueAssetsMeasuredOnRecurringBasisRealizedGainLossDuringPeriodIncludedInOtherIncome	28504000	USD
	rnr	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Reclassified From Other Assets FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisReclassifiedFromOtherAssets	0	USD
	rnr	Gain Loss On Investments Including Discontinued Operations GainLossOnInvestmentsIncludingDiscontinuedOperations	75681000	USD
	rnr	Gain Loss On Investments Including Discontinued Operations GainLossOnInvestmentsIncludingDiscontinuedOperations	-55273000	USD
CY2012Q2	rnr	Gross Premiums Written Direct And Assumed GrossPremiumsWrittenDirectAndAssumed	667336000	USD
	rnr	Gross Premiums Written Direct And Assumed GrossPremiumsWrittenDirectAndAssumed	1338641000	USD
	rnr	Gross Premiums Written Direct And Assumed GrossPremiumsWrittenDirectAndAssumed	1331487000	USD
CY2013Q2	rnr	Gross Premiums Written Direct And Assumed GrossPremiumsWrittenDirectAndAssumed	703223000	USD
	rnr	Investment Income Before Investment Expenses InvestmentIncomeBeforeInvestmentExpenses	76294000	USD
	rnr	Investment Income Before Investment Expenses InvestmentIncomeBeforeInvestmentExpenses	88574000	USD
CY2013Q2	rnr	Investment Income Before Investment Expenses InvestmentIncomeBeforeInvestmentExpenses	30160000	USD
CY2012Q2	rnr	Investment Income Before Investment Expenses InvestmentIncomeBeforeInvestmentExpenses	20397000	USD
	rnr	Net Claims And Claim Expense Ratio Calendar Year NetClaimsAndClaimExpenseRatioCalendarYear	0.233
	rnr	Net Claims And Claim Expense Ratio Calendar Year NetClaimsAndClaimExpenseRatioCalendarYear	0.124
CY2013Q2	rnr	Net Claims And Claim Expense Ratio Calendar Year NetClaimsAndClaimExpenseRatioCalendarYear	0.356
CY2012Q2	rnr	Net Claims And Claim Expense Ratio Calendar Year NetClaimsAndClaimExpenseRatioCalendarYear	0.203
	rnr	Net Claims And Claim Expense Ratio Prior Years NetClaimsAndClaimExpenseRatioPriorYears	-0.114
	rnr	Net Claims And Claim Expense Ratio Prior Years NetClaimsAndClaimExpenseRatioPriorYears	-0.194
CY2013Q2	rnr	Net Claims And Claim Expense Ratio Prior Years NetClaimsAndClaimExpenseRatioPriorYears	-0.092
CY2012Q2	rnr	Net Claims And Claim Expense Ratio Prior Years NetClaimsAndClaimExpenseRatioPriorYears	-0.186
	rnr	Net Claims And Claims Expense Ratio Current Year NetClaimsAndClaimsExpenseRatioCurrentYear	0.347
	rnr	Net Claims And Claims Expense Ratio Current Year NetClaimsAndClaimsExpenseRatioCurrentYear	0.318
CY2013Q2	rnr	Net Claims And Claims Expense Ratio Current Year NetClaimsAndClaimsExpenseRatioCurrentYear	0.448
CY2012Q2	rnr	Net Claims And Claims Expense Ratio Current Year NetClaimsAndClaimsExpenseRatioCurrentYear	0.389
CY2013Q2	rnr	Other Assets Net OtherAssetsNet	516191000	USD
	rnr	Other Comprehensive Income Loss Adjustment For Realized And Unrealized Investment Gains Losses And Net Other Than Temporary Impairments Portion Attributable To Parent Available For Sale Securities OtherComprehensiveIncomeLossAdjustmentForRealizedAndUnrealizedInvestmentGainsLossesAndNetOtherThanTemporaryImpairmentsPortionAttributableToParentAvailableForSaleSecurities	2529000	USD
CY2012Q4	rnr	Other Assets Net OtherAssetsNet	395564000	USD
CY2013Q2	rnr	Other Comprehensive Income Loss Adjustment For Realized And Unrealized Investment Gains Losses And Net Other Than Temporary Impairments Portion Attributable To Parent Available For Sale Securities OtherComprehensiveIncomeLossAdjustmentForRealizedAndUnrealizedInvestmentGainsLossesAndNetOtherThanTemporaryImpairmentsPortionAttributableToParentAvailableForSaleSecurities	178000	USD
CY2012Q2	rnr	Other Comprehensive Income Loss Adjustment For Realized And Unrealized Investment Gains Losses And Net Other Than Temporary Impairments Portion Attributable To Parent Available For Sale Securities OtherComprehensiveIncomeLossAdjustmentForRealizedAndUnrealizedInvestmentGainsLossesAndNetOtherThanTemporaryImpairmentsPortionAttributableToParentAvailableForSaleSecurities	105000	USD
	rnr	Other Comprehensive Income Loss Adjustment For Realized And Unrealized Investment Gains Losses And Net Other Than Temporary Impairments Portion Attributable To Parent Available For Sale Securities OtherComprehensiveIncomeLossAdjustmentForRealizedAndUnrealizedInvestmentGainsLossesAndNetOtherThanTemporaryImpairmentsPortionAttributableToParentAvailableForSaleSecurities	-1533000	USD
	rnr	Underwriting Expense Ratio UnderwritingExpenseRatio	0.256
CY2013Q2	rnr	Underwriting Expense Ratio UnderwritingExpenseRatio	0.256
	rnr	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-1533000	USD
CY2013Q2	rnr	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	178000	USD
CY2013Q2	rnr	Other Liabilities Net OtherLiabilitiesNet	680009000	USD
CY2012Q4	rnr	Other Liabilities Net OtherLiabilitiesNet	532225000	USD
	rnr	Payments For Proceeds From Other Investments PaymentsForProceedsFromOtherInvestments	-42935000	USD
	rnr	Payments For Proceeds From Other Investments PaymentsForProceedsFromOtherInvestments	-18681000	USD
	rnr	Payments For Proceeds From Other Short Term Investments PaymentsForProceedsFromOtherShortTermInvestments	110562000	USD
	rnr	Payments For Proceeds From Other Short Term Investments PaymentsForProceedsFromOtherShortTermInvestments	-183605000	USD
CY2013Q2	rnr	Preferred Stock Amount Of Preferred Dividends In Arrears Equivalent Number Of Periods Trigger PreferredStockAmountOfPreferredDividendsInArrearsEquivalentNumberOfPeriodsTrigger	6	period
CY2013Q2	rnr	Preferred Stock Preferred Stock Dividends In Arrears Triggered Shareholder Election Right Number Of Directors PreferredStockPreferredStockDividendsInArrearsTriggeredShareholderElectionRightNumberOfDirectors	2	director
	rnr	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-8713000	USD
CY2013Q2	rnr	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-1141000	USD
CY2013Q2	rnr	Securities Debt SecuritiesDebt	4412091000	USD
CY2013Q2	rnr	Securities Debt Amortized Cost Basis SecuritiesDebtAmortizedCostBasis	4424125000	USD
CY2013Q2	rnr	Securities Debt Maturities After Five Through Ten Years Amortized Cost Basis SecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCostBasis	542012000	USD
CY2013Q2	rnr	Securities Debt Maturities After Five Through Ten Years Fair Value SecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	530724000	USD
CY2013Q2	rnr	Securities Debt Maturities After One Through Five Years Amortized Cost Basis SecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCostBasis	2598783000	USD
CY2013Q2	rnr	Securities Debt Maturities After One Through Five Years Fair Value SecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	2583929000	USD
CY2013Q2	rnr	Securities Debt Maturities After Ten Years Amortized Cost Basis SecuritiesDebtMaturitiesAfterTenYearsAmortizedCostBasis	110944000	USD
CY2013Q2	rnr	Securities Debt Maturities After Ten Years Fair Value SecuritiesDebtMaturitiesAfterTenYearsFairValue	115929000	USD
CY2013Q2	rnr	Securities Debt Maturities Within One Year Amortized Cost Basis SecuritiesDebtMaturitiesWithinOneYearAmortizedCostBasis	202283000	USD
CY2013Q2	rnr	Securities Debt Maturities Within One Year Fair Value SecuritiesDebtMaturitiesWithinOneYearFairValue	200706000	USD
CY2013Q2	rnr	Securities Purchased Under Agreements To Resell Required Collateral Percentage Of Principal SecuritiesPurchasedUnderAgreementsToResellRequiredCollateralPercentageOfPrincipal	1.02
CY2012Q4	rnr	Total Assets And Liabilities Measured At Fair Value On Recurring Basis TotalAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis	6302008000	USD
CY2013Q2	rnr	Total Assets And Liabilities Measured At Fair Value On Recurring Basis TotalAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis	6070734000	USD
CY2012Q4	rnr	Total Other Assets And Liabilities Measured On Recurring Basis TotalOtherAssetsAndLiabilitiesMeasuredOnRecurringBasis	29085000	USD
CY2013Q2	rnr	Total Other Assets And Liabilities Measured On Recurring Basis TotalOtherAssetsAndLiabilitiesMeasuredOnRecurringBasis	-5426000	USD
CY2013Q2	rnr	Trading Debt Securities Amortized Cost Basis TradingDebtSecuritiesAmortizedCostBasis	4388031000	USD
CY2013Q2	rnr	Trading Securities Debt Maturities After Five Through Ten Years Amortized Cost Basis TradingSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCostBasis	541365000	USD
CY2013Q2	rnr	Trading Securities Debt Maturities After Five Through Ten Years Fair Value TradingSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	530047000	USD
CY2013Q2	rnr	Trading Securities Debt Maturities After One Through Five Years Amortized Cost Basis TradingSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCostBasis	2597123000	USD
CY2013Q2	rnr	Trading Securities Debt Maturities After One Through Five Years Fair Value TradingSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	2582090000	USD
CY2013Q2	rnr	Trading Securities Debt Maturities After Ten Years Amortized Cost Basis TradingSecuritiesDebtMaturitiesAfterTenYearsAmortizedCostBasis	110405000	USD
CY2012Q2	rnr	Underwriting Expense Ratio UnderwritingExpenseRatio	0.274
CY2013Q2	rnr	Trading Securities Debt Maturities After Ten Years Fair Value TradingSecuritiesDebtMaturitiesAfterTenYearsFairValue	115280000	USD
CY2013Q2	rnr	Trading Securities Debt Maturities Within One Year Amortized Cost Basis TradingSecuritiesDebtMaturitiesWithinOneYearAmortizedCostBasis	202283000	USD
CY2013Q2	rnr	Trading Securities Debt Maturities Within One Year Fair Value TradingSecuritiesDebtMaturitiesWithinOneYearFairValue	200706000	USD
	rnr	Underwriting Income Loss Net UnderwritingIncomeLossNet	286322000	USD
	rnr	Underwriting Income Loss Net UnderwritingIncomeLossNet	324469000	USD
CY2013Q2	rnr	Underwriting Income Loss Net UnderwritingIncomeLossNet	113341000	USD
CY2012Q2	rnr	Underwriting Income Loss Net UnderwritingIncomeLossNet	127850000	USD
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2013
	dei	Document Period End Date DocumentPeriodEndDate	2013-06-30
	dei	Document Type DocumentType	10-Q
	dei	Entity Central Index Key EntityCentralIndexKey	0000913144
CY2013Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	44606311	shares
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Registrant Name EntityRegistrantName	RENAISSANCERE HOLDINGS LTD.
	dei	Trading Symbol TradingSymbol	RNR

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$RNR
RENAISSANCERE HOLDINGS LTD Stock $rnr

2013 Q2 Form 10-Q Financial Statement

#000144530513001786 Filed on August 01, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$RNR RENAISSANCERE HOLDINGS LTD Stock $rnr

2013 Q2 Form 10-Q Financial Statement

#000144530513001786 Filed on August 01, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$RNR
RENAISSANCERE HOLDINGS LTD Stock $rnr