$RLI
RLI Corp Stock $rli

$rli Overview Financials Valuation SEC Filings Company Website

2010 Q4 Form 8-K Financial Statement

#000110465912084665 Filed on December 17, 2012

Income Statement

Concept	2010 Q4	2010 Q3	2010 Q2
Revenue	$16.67M	$149.6M	$16.77M
YoY Change	-88.57%	2.47%	-88.41%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin	$2.600M	$2.100M	$1.500M
YoY Change	23.81%	-4.55%	-25.0%
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization
YoY Change
% of Gross Profit
Operating Expenses	$99.50M	$108.8M	$92.50M
YoY Change	-0.1%	6.67%	-7.04%
Operating Profit
YoY Change
Interest Expense	-$1.700M	$100.0K	$1.900M
YoY Change	0.0%	-125.0%	58.33%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$50.88M	$41.43M	$51.08M
YoY Change	13.83%	-5.19%	9.85%
Income Tax	$10.20M	$13.00M	$17.20M
% Of Pretax Income	20.05%	31.38%	33.67%
Net Earnings	$40.30M	$28.00M	$35.00M
YoY Change	31.7%	-9.68%	2.64%
Net Earnings / Revenue	241.72%	18.72%	208.77%
Basic Earnings Per Share
Diluted Earnings Per Share	$952.7K	$663.5K	$825.5K
COMMON SHARES
Basic Shares Outstanding
Diluted Shares Outstanding

Balance Sheet

Concept	2010 Q4	2010 Q3	2010 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$0.00
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$18.37M	$18.10M	$18.10M
YoY Change	-3.82%	-7.65%	-10.4%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$43.36M	$2.030B	$1.926B
YoY Change	-97.71%	6.78%	7.02%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$2.480B	$2.674B	$2.612B
YoY Change	-2.3%	4.32%	5.21%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$42.40M	$32.90M	$26.10M
YoY Change	1.44%	-9.37%	-1.51%
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	$42.40M	$32.90M	$26.10M
YoY Change	1.44%	-9.37%	-1.51%
LONG-TERM LIABILITIES
Long-Term Debt	$100.0M	$100.0M	$100.0M
YoY Change	0.0%	0.0%	0.0%
Other Long-Term Liabilities	$15.40M	$75.20M	$69.50M
YoY Change	-73.85%	23.08%	20.66%
Total Long-Term Liabilities	$115.4M	$175.2M	$169.5M
YoY Change	-27.38%	8.75%	7.55%
TOTAL LIABILITIES
Total Short-Term Liabilities	$42.40M	$32.90M	$26.10M
Total Long-Term Liabilities	$115.4M	$175.2M	$169.5M
Total Liabilities	$1.711B	$1.761B	$1.754B
YoY Change	0.28%	1.46%	2.01%
SHAREHOLDERS EQUITY
Retained Earnings	$812.2M
YoY Change
Common Stock	$247.4M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$392.8M
YoY Change
Treasury Stock Shares	11.35M shares
Shareholders Equity	$769.2M	$912.2M	$858.5M
YoY Change
Total Liabilities & Shareholders Equity	$2.480B	$2.674B	$2.612B
YoY Change	-2.3%	4.32%	5.21%

Cashflow Statement

Concept	2010 Q4	2010 Q3	2010 Q2
OPERATING ACTIVITIES
Net Income	$40.30M	$28.00M	$35.00M
YoY Change	31.7%	-9.68%	2.64%
Depreciation, Depletion And Amortization
YoY Change
Cash From Operating Activities	$12.30M	$52.40M	$37.90M
YoY Change	-36.6%	11.97%	-34.2%
INVESTING ACTIVITIES
Capital Expenditures	-$1.500M	-$800.0K	-$100.0K
YoY Change	-86.49%	300.0%	-50.0%
Acquisitions
YoY Change
Other Investing Activities	$146.8M	-$46.80M	-$23.40M
YoY Change	795.12%	10.12%	-55.6%
Cash From Investing Activities	$145.3M	-$47.60M	-$23.50M
YoY Change	2641.51%	11.48%	-55.58%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-157.7M	-4.700M	-14.50M
YoY Change	538.46%	17.5%	202.08%
NET CHANGE
Cash From Operating Activities	12.30M	52.40M	37.90M
Cash From Investing Activities	145.3M	-47.60M	-23.50M
Cash From Financing Activities	-157.7M	-4.700M	-14.50M
Net Change In Cash	-100.0K	100.0K	-100.0K
YoY Change		0.0%	0.0%
FREE CASH FLOW
Cash From Operating Activities	$12.30M	$52.40M	$37.90M
Capital Expenditures	-$1.500M	-$800.0K	-$100.0K
Free Cash Flow	$13.80M	$53.20M	$38.00M
YoY Change	-54.75%	13.19%	-34.26%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2011Q4	us-gaap	Assets Assets	2654834000	USD
CY2012Q1	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Cumulative Effect Of Change On Equity Or Net Assets NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets	-26200000	USD
CY2012Q1	rli	New Accounting Pronouncement Or Change In Accounting Principle Reduction In Book Value Per Share At Adoption NewAccountingPronouncementOrChangeInAccountingPrincipleReductionInBookValuePerShareAtAdoption	1.24
CY2011Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	5486000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	4869000	USD
CY2011Q4	us-gaap	Investments Investments	1900288000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	1862200000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	792634000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2654834000	USD
CY2010Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	15000	USD
CY2010Q4	us-gaap	Marketable Securities Equity Securities MarketableSecuritiesEquitySecurities	321897000	USD
CY2010Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	39787000	USD
CY2010Q4	us-gaap	Investments Investments	1803021000	USD
CY2010Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	14615000	USD
CY2010Q4	rli	Premiums And Reinsurance Balances Receivable PremiumsAndReinsuranceBalancesReceivable	107391000	USD
CY2010Q4	us-gaap	Prepaid Reinsurance Premiums PrepaidReinsurancePremiums	62631000	USD
CY2010Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	40242000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	18370000	USD
CY2010Q4	us-gaap	Equity Method Investments EquityMethodInvestments	43358000	USD
CY2010Q4	rli	Goodwill And Intangibles GoodwillAndIntangibles	26214000	USD
CY2010Q4	us-gaap	Other Assets OtherAssets	10394000	USD
CY2010Q4	us-gaap	Assets Assets	2480399000	USD
CY2010Q4	us-gaap	Liability For Claims And Claims Adjustment Expense Property Casualty Liability LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability	1173943000	USD
CY2010Q4	us-gaap	Unearned Premiums UnearnedPremiums	301537000	USD
CY2010Q4	us-gaap	Reinsurance Payable ReinsurancePayable	23851000	USD
CY2010Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	78563000	USD
CY2010Q4	us-gaap	Long Term Debt LongTermDebt	100000000	USD
CY2011	rli	Policy Acquisition Cost Amortization Expense And Direct Period Costs PolicyAcquisitionCostAmortizationExpenseAndDirectPeriodCosts	183868000	USD
CY2009	rli	Deferred Policy Acquisition Costs Reductions Ceding Commissions DeferredPolicyAcquisitionCostsReductionsCedingCommissions	26156000	USD
CY2010	rli	Deferred Policy Acquisition Costs Reductions Ceding Commissions DeferredPolicyAcquisitionCostsReductionsCedingCommissions	24472000	USD
CY2011	rli	Deferred Policy Acquisition Costs Reductions Ceding Commissions DeferredPolicyAcquisitionCostsReductionsCedingCommissions	24721000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	92606000	USD
CY2010	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	5087000	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	43.23
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.2591	pure
CY2010Q4	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	42436000	USD
CY2010Q4	us-gaap	Other Liabilities OtherLiabilities	15447000	USD
CY2010Q4	us-gaap	Liabilities Liabilities	1711248000	USD
CY2010Q4	us-gaap	Common Stock Value CommonStockValue	32318000	USD
CY2010Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	215066000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	95992000	USD
CY2010Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	812150000	USD
CY2010Q4	us-gaap	Common Stock Issued Employee Stock Trust CommonStockIssuedEmployeeStockTrust	-6474000	USD
CY2010Q4	us-gaap	Treasury Stock Value TreasuryStockValue	392849000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	769151000	USD
CY2010Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2480399000	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Maturities Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost	1085728000	USD
CY2010Q4	us-gaap	Available For Sale Securities Debt Maturities Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost	1093869000	USD
CY2011Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	260981000	USD
CY2010Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	303384000	USD
CY2011Q4	rli	Trading Securities Debt Amortized Cost TradingSecuritiesDebtAmortizedCost	7000	USD
CY2010Q4	rli	Trading Securities Debt Amortized Cost TradingSecuritiesDebtAmortizedCost	13000	USD
CY2011Q4	rli	Available For Sale Securities Equity Securities Amortized Cost AvailableForSaleSecuritiesEquitySecuritiesAmortizedCost	269400000	USD
CY2010Q4	rli	Available For Sale Securities Equity Securities Amortized Cost AvailableForSaleSecuritiesEquitySecuritiesAmortizedCost	213069000	USD
CY2011Q4	rli	Premiums And Reinsurance Balances Receivable Allowances PremiumsAndReinsuranceBalancesReceivableAllowances	13653000	USD
CY2010Q4	rli	Premiums And Reinsurance Balances Receivable Allowances PremiumsAndReinsuranceBalancesReceivableAllowances	14128000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	45647000	USD
CY2010Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	38703000	USD
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2010Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	32627244	shares
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2010Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2010Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	32317691	shares
CY2011Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	11465107	shares
CY2010Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	11353151	shares
CY2010	us-gaap	Premiums Earned Net Property And Casualty PremiumsEarnedNetPropertyAndCasualty	493382000	USD
CY2009	us-gaap	Premiums Earned Net Property And Casualty PremiumsEarnedNetPropertyAndCasualty	491961000	USD
CY2010	us-gaap	Net Investment Income NetInvestmentIncome	66799000	USD
CY2009	us-gaap	Net Investment Income NetInvestmentIncome	67346000	USD
CY2009	us-gaap	Impairment Of Investments ImpairmentOfInvestments	45293000	USD
CY2010	us-gaap	Revenues Revenues	583424000	USD
CY2009	us-gaap	Revenues Revenues	546552000	USD
CY2010	us-gaap	Incurred Claims Property Casualty And Liability IncurredClaimsPropertyCasualtyAndLiability	201332000	USD
CY2009	us-gaap	Incurred Claims Property Casualty And Liability IncurredClaimsPropertyCasualtyAndLiability	203388000	USD
CY2010	us-gaap	Operating Expenses OperatingExpenses	38584000	USD
CY2009	us-gaap	Operating Expenses OperatingExpenses	39768000	USD
CY2010	us-gaap	Interest Expense Debt InterestExpenseDebt	6050000	USD
CY2009	us-gaap	Interest Expense Debt InterestExpenseDebt	6050000	USD
CY2010	us-gaap	Other General Expense OtherGeneralExpense	7998000	USD
CY2009	us-gaap	Other General Expense OtherGeneralExpense	7941000	USD
CY2010	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	410858000	USD
CY2009	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	421342000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	7101000	USD
CY2009	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	5052000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	179667000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	130262000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	51433000	USD
CY2009	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	23687000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	37000	USD
CY2009	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	14144000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	51470000	USD
CY2009	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	37831000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	128197000	USD
CY2009	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	92431000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	33552000	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	53995000	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	14971000	USD
CY2009	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-8286000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	18581000	USD
CY2009	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	62281000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	146778000	USD
CY2009	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	154712000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	6.10
CY2010	rli	Comprehensive Earnings Per Share Basic ComprehensiveEarningsPerShareBasic	6.98
CY2009	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	4.29
CY2009	rli	Comprehensive Earnings Per Share Basic ComprehensiveEarningsPerShareBasic	7.18
CY2010	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	6.04
CY2010	rli	Comprehensive Earnings Per Share Diluted ComprehensiveEarningsPerShareDiluted	6.91
CY2009	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	4.25
CY2009	rli	Comprehensive Earnings Per Share Diluted ComprehensiveEarningsPerShareDiluted	7.12
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	21020000	shares
CY2009	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	21562000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	21241000	shares
CY2009	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	21731000	shares
CY2011	us-gaap	Revenues Revenues	619169000	USD
CY2011	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	442080000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	183586000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	147931000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	126598000	USD
CY2010	us-gaap	Depreciation Depreciation	3037000	USD
CY2009	us-gaap	Depreciation Depreciation	3284000	USD
CY2010	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	-2230000	USD
CY2009	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	-381000	USD
CY2010	rli	Increase Decrease In Premiums And Reinsurance Receivable IncreaseDecreaseInPremiumsAndReinsuranceReceivable	23430000	USD
CY2009	rli	Increase Decrease In Premiums And Reinsurance Receivable IncreaseDecreaseInPremiumsAndReinsuranceReceivable	-8188000	USD
CY2010	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	1420000	USD
CY2009	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	-7793000	USD
CY2010	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	-2748000	USD
CY2009	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	-598000	USD
CY2010	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	17771000	USD
CY2009	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	-13892000	USD
CY2010	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	-268000	USD
CY2009	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	-4815000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	601000	USD
CY2009	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	8941000	USD
CY2010	us-gaap	Increase Decrease In Property And Casualty Insurance Liabilities IncreaseDecreaseInPropertyAndCasualtyInsuranceLiabilities	27483000	USD
CY2009	us-gaap	Increase Decrease In Property And Casualty Insurance Liabilities IncreaseDecreaseInPropertyAndCasualtyInsuranceLiabilities	-12851000	USD
CY2010	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	-10990000	USD
CY2009	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	-22643000	USD
CY2010	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	16691000	USD
CY2009	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-3412000	USD
CY2010	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	2732000	USD
CY2009	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	444000	USD
CY2010	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	7920000	USD
CY2010	us-gaap	Proceeds From Payments For Trading Securities ProceedsFromPaymentsForTradingSecurities	1009000	USD
CY2009	us-gaap	Proceeds From Payments For Trading Securities ProceedsFromPaymentsForTradingSecurities	9353000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	100235000	USD
CY2009	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	127759000	USD
CY2010	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	348252000	USD
CY2009	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	231456000	USD
CY2010	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	549843000	USD
CY2009	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	622826000	USD
CY2010	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	63504000	USD
CY2009	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	123861000	USD
CY2010	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2841000	USD
CY2009	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	11565000	USD
CY2010	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	323887000	USD
CY2009	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	230604000	USD
CY2010	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	35559000	USD
CY2009	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	178098000	USD
CY2010	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	64673000	USD
CY2009	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	23715000	USD
CY2010	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	544000	USD
CY2009	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	10736000	USD
CY2010	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	249927000	USD
CY2009	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	60412000	USD
CY2010	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	382456000	USD
CY2009	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	390044000	USD
CY2009	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-96099000	USD
CY2010	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	2732000	USD
CY2009	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	444000	USD
CY2009	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	4804000	USD
CY2010	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	23858000	USD
CY2009	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	19251000	USD
CY2009	us-gaap	Proceeds From Sale Of Treasury Stock ProceedsFromSaleOfTreasuryStock	5222000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	176802000	USD
CY2009	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	22879000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-192841000	USD
CY2009	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-31660000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-124448000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	87641000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	117991000	USD
CY2008Q4	us-gaap	Stockholders Equity StockholdersEquity	686578000	USD
CY2009	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	19251000	USD
CY2009	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	5222000	USD
CY2009	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	444000	USD
CY2009	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	4804000	USD
CY2009	us-gaap	Dividends Common Stock DividendsCommonStock	23249000	USD
CY2009Q4	us-gaap	Stockholders Equity StockholdersEquity	809260000	USD
CY2010	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	23858000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	2732000	USD
CY2010	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	5087000	USD
CY2010	us-gaap	Dividends Common Stock DividendsCommonStock	170848000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	21333000	USD
CY2011	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	6624000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	4210000	USD
CY2011	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	8821000	USD
CY2011	us-gaap	Dividends Common Stock DividendsCommonStock	130855000	USD
CY2009	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.08
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	8.15
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	6.19
CY2011	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	6.01
CY2011	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	5.91
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	21078000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	21434000	shares
CY2011Q4	us-gaap	Supplementary Insurance Information Unearned Premiums SupplementaryInsuranceInformationUnearnedPremiums	341267000	USD
CY2009	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Net Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmount	491961000	USD
CY2009	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Percentage Of Amount Assumed To Net ReinsurancePremiumsForInsuranceCompaniesByProductSegmentPercentageOfAmountAssumedToNet	0.029	pure
CY2011Q4	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.0602	pure
CY2011Q4	us-gaap	Liability For Claims And Claims Adjustment Expense Property Casualty Liability LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability	1150714000	USD
CY2011Q4	us-gaap	Supplementary Insurance Information Deferred Policy Acquisition Costs SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts	52105000	USD
CY2011	us-gaap	Supplementary Insurance Information Premium Revenue SupplementaryInsuranceInformationPremiumRevenue	538452000	USD
CY2011	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	310145000	USD
CY2011	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-110061000	USD
CY2011	us-gaap	Supplementary Insurance Information Other Operating Expense SupplementaryInsuranceInformationOtherOperatingExpense	44312000	USD
CY2011	us-gaap	Supplementary Insurance Information Premiums Written SupplementaryInsuranceInformationPremiumsWritten	549638000	USD
CY2010Q4	us-gaap	Supplementary Insurance Information Deferred Policy Acquisition Costs SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts	40242000	USD
CY2010Q4	us-gaap	Supplementary Insurance Information Unearned Premiums SupplementaryInsuranceInformationUnearnedPremiums	301537000	USD
CY2010	us-gaap	Supplementary Insurance Information Premium Revenue SupplementaryInsuranceInformationPremiumRevenue	493382000	USD
CY2010	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	284575000	USD
CY2010	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-83243000	USD
CY2010	us-gaap	Supplementary Insurance Information Other Operating Expense SupplementaryInsuranceInformationOtherOperatingExpense	38584000	USD
CY2010	us-gaap	Supplementary Insurance Information Premiums Written SupplementaryInsuranceInformationPremiumsWritten	485140000	USD
CY2009Q4	us-gaap	Supplementary Insurance Information Deferred Policy Acquisition Costs SupplementaryInsuranceInformationDeferredPolicyAcquisitionCosts	40510000	USD
CY2009Q4	us-gaap	Liability For Claims And Claims Adjustment Expense Property Casualty Liability LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability	1146460000	USD
CY2009Q4	us-gaap	Supplementary Insurance Information Unearned Premiums SupplementaryInsuranceInformationUnearnedPremiums	312527000	USD
CY2009	us-gaap	Supplementary Insurance Information Premium Revenue SupplementaryInsuranceInformationPremiumRevenue	491961000	USD
CY2009	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	269965000	USD
CY2009	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-66577000	USD
CY2009	us-gaap	Supplementary Insurance Information Other Operating Expense SupplementaryInsuranceInformationOtherOperatingExpense	39768000	USD
CY2009	us-gaap	Supplementary Insurance Information Premiums Written SupplementaryInsuranceInformationPremiumsWritten	469916000	USD
CY2011	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Gross Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentGrossAmount	625963000	USD
CY2011	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Ceded To Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountCededToOtherCompanies	154495000	USD
CY2011	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Assumed From Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountAssumedFromOtherCompanies	66984000	USD
CY2011	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Net Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmount	538452000	USD
CY2011	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Percentage Of Amount Assumed To Net ReinsurancePremiumsForInsuranceCompaniesByProductSegmentPercentageOfAmountAssumedToNet	0.124	pure
CY2010	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Gross Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentGrossAmount	599669000	USD
CY2010	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Ceded To Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountCededToOtherCompanies	153924000	USD
CY2010	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Assumed From Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountAssumedFromOtherCompanies	47637000	USD
CY2010	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Net Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmount	493382000	USD
CY2010	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Percentage Of Amount Assumed To Net ReinsurancePremiumsForInsuranceCompaniesByProductSegmentPercentageOfAmountAssumedToNet	0.097	pure
CY2009	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Gross Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentGrossAmount	640034000	USD
CY2009	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Ceded To Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountCededToOtherCompanies	162362000	USD
CY2009	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Assumed From Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountAssumedFromOtherCompanies	14289000	USD
CY2010Q4	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.0602	pure
CY2009Q4	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.0602	pure
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Policyholder Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPolicyholderLiabilities	26781000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Unearned Premiums Reserve DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve	19575000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	3954000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	298000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	64840000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	64840000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Policy Acquisition Cost DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost	18236000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	13016000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1190000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-37867000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Policyholder Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPolicyholderLiabilities	30541000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Unearned Premiums Reserve DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve	16723000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	56601000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	56601000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Policy Acquisition Cost DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost	14084000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	11380000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	196000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-21962000	USD
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2010	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2009	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35	pure
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	64255000	USD
CY2011	us-gaap	Income Tax Reconciliation Deductions Dividends IncomeTaxReconciliationDeductionsDividends	1980000	USD
CY2011	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	3367000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	2412000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	492000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	56988000	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	62883000	USD
CY2009	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	45592000	USD
CY2010	us-gaap	Income Tax Reconciliation Deductions Dividends IncomeTaxReconciliationDeductionsDividends	1628000	USD
CY2010	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	4358000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	3221000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-2206000	USD
CY2009	us-gaap	Income Tax Reconciliation Deductions Dividends IncomeTaxReconciliationDeductionsDividends	1449000	USD
CY2009	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	563000	USD
CY2009	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	5171000	USD
CY2009	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-578000	USD
CY2010	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.286	pure
CY2009	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.290	pure
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.310	pure
CY2011	rli	Capital Gains Tax Rate CapitalGainsTaxRate	0.35	pure
CY2010Q4	rli	Income Tax Reconciliation Deductions Dividends Received IncomeTaxReconciliationDeductionsDividendsReceived	2200000	USD
CY2010	rli	Effective Income Tax Rate Reconciliation Deductions Dividends Received EffectiveIncomeTaxRateReconciliationDeductionsDividendsReceived	0.01	pure
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	6467000	USD
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1961000	USD
CY2011	rli	Percentage Of Non Qualified Options PercentageOfNonQualifiedOptions	0.98	pure
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1280866	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	297950	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	28290	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	603936	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1524982	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	223150	shares
CY2010	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	244505	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	42864	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	833331	shares
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1583803	shares
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	261000	shares
CY2009	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	82415	shares
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	23910	shares
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	906172	shares
CY2008Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1429128	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	55.03
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	34.61
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	41.64
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	39.80
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	41.32
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	49.07
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	28.95
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	40.15
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	37.96
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	44.73
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	47.97
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	28.87
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	51.82
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	40.17
CY2008Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	43.35
CY2011Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm1	5.62
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Remaining Contractual Term ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm	4.54
CY2010Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm1	5.79
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Remaining Contractual Term ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm	4.86
CY2009Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm1	5.99
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Remaining Contractual Term ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm	4.78
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	12764000	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	37949000	USD
CY2011Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	19965000	USD
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	17161000	USD
CY2010Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	12176000	USD
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	13487000	USD
CY2009Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	11850000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	13.20
CY2010	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3100000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1100000	USD
CY2010Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	3700000	USD
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	11.40
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	12.91
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0206	pure
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0258	pure
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0210	pure
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0189	pure
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0174	pure
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0161	pure
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.2568	pure
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.2619	pure
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	5.54
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	5.61
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	5.73
CY2011	rli	Share Based Compensation Arrangement By Share Based Payment Award Dividend Yield Basis Period ShareBasedCompensationArrangementByShareBasedPaymentAwardDividendYieldBasisPeriod	5
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CY2009Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	10.82
CY2009	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1000000	USD
CY2011	rli	Share Based Compensation Arrangement By Share Based Payment Award Volatility Basis Period ShareBasedCompensationArrangementByShareBasedPaymentAwardVolatilityBasisPeriod	1
CY2011	rli	Capital And Operating Lease Expense CapitalAndOperatingLeaseExpense	5000000	USD
CY2010	rli	Capital And Operating Lease Expense CapitalAndOperatingLeaseExpense	4200000	USD
CY2009	rli	Capital And Operating Lease Expense CapitalAndOperatingLeaseExpense	4100000	USD
CY2011Q4	rli	Capital And Operating Leases Future Minimum Payments Due In Two Years CapitalAndOperatingLeasesFutureMinimumPaymentsDueInTwoYears	3348000	USD
CY2011Q4	rli	Capital And Operating Leases Future Minimum Payments Due In Three Years CapitalAndOperatingLeasesFutureMinimumPaymentsDueInThreeYears	3361000	USD
CY2011Q4	rli	Capital And Operating Leases Future Minimum Payments Due In Four Years CapitalAndOperatingLeasesFutureMinimumPaymentsDueInFourYears	2581000	USD
CY2011Q4	rli	Capital And Operating Leases Future Minimum Payments Due Current CapitalAndOperatingLeasesFutureMinimumPaymentsDueCurrent	4328000	USD
CY2011Q4	rli	Capital And Operating Leases Future Minimum Payments Due CapitalAndOperatingLeasesFutureMinimumPaymentsDue	16959000	USD
CY2008Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	45325000	USD
CY2009Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	40510000	USD
CY2011Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	52105000	USD
CY2009	rli	Deferred Policy Acquisition Costs Additions Direct Commissions DeferredPolicyAcquisitionCostsAdditionsDirectCommissions	100727000	USD
CY2010	rli	Deferred Policy Acquisition Costs Additions Direct Commissions DeferredPolicyAcquisitionCostsAdditionsDirectCommissions	101523000	USD
CY2011	rli	Deferred Policy Acquisition Costs Additions Direct Commissions DeferredPolicyAcquisitionCostsAdditionsDirectCommissions	116206000	USD
CY2009	rli	Deferred Policy Acquisition Costs Additions Premium Taxes DeferredPolicyAcquisitionCostsAdditionsPremiumTaxes	6596000	USD
CY2010	rli	Deferred Policy Acquisition Costs Additions Premium Taxes DeferredPolicyAcquisitionCostsAdditionsPremiumTaxes	6809000	USD
CY2011	rli	Deferred Policy Acquisition Costs Additions Premium Taxes DeferredPolicyAcquisitionCostsAdditionsPremiumTaxes	8725000	USD
CY2009	rli	Deferred Policy Acquisition Costs Additions Other Direct Underwriting Expenses DeferredPolicyAcquisitionCostsAdditionsOtherDirectUnderwritingExpenses	69496000	USD
CY2010	rli	Deferred Policy Acquisition Costs Additions Other Direct Underwriting Expenses DeferredPolicyAcquisitionCostsAdditionsOtherDirectUnderwritingExpenses	67030000	USD
CY2011	rli	Deferred Policy Acquisition Costs Additions Other Direct Underwriting Expenses DeferredPolicyAcquisitionCostsAdditionsOtherDirectUnderwritingExpenses	80022000	USD
CY2009	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	81167000	USD
CY2010	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	83860000	USD
CY2011	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	100210000	USD
CY2011Q4	rli	Reinsurance Net Loss On Individual Risk Maximum ReinsuranceNetLossOnIndividualRiskMaximum	3000000	USD
CY2011Q4	rli	Reinsurance Retentions Low End Of Range ReinsuranceRetentionsLowEndOfRange	200000	USD
CY2011Q4	rli	Reinsurance Retentions High End Of Range ReinsuranceRetentionsHighEndOfRange	8800000	USD
CY2011	us-gaap	Direct Premiums Written Property And Casualty DirectPremiumsWrittenPropertyAndCasualty	629727000	USD
CY2011	us-gaap	Assumed Premiums Written Property And Casualty AssumedPremiumsWrittenPropertyAndCasualty	72380000	USD
CY2011	us-gaap	Ceded Premiums Written Property And Casualty CededPremiumsWrittenPropertyAndCasualty	152469000	USD
CY2011	us-gaap	Premiums Written Net Property And Casualty PremiumsWrittenNetPropertyAndCasualty	549638000	USD
CY2010	us-gaap	Direct Premiums Written Property And Casualty DirectPremiumsWrittenPropertyAndCasualty	586624000	USD
CY2009	us-gaap	Direct Premiums Written Property And Casualty DirectPremiumsWrittenPropertyAndCasualty	614887000	USD
CY2010	us-gaap	Assumed Premiums Written Property And Casualty AssumedPremiumsWrittenPropertyAndCasualty	49692000	USD
CY2009	us-gaap	Assumed Premiums Written Property And Casualty AssumedPremiumsWrittenPropertyAndCasualty	16313000	USD
CY2010	us-gaap	Ceded Premiums Written Property And Casualty CededPremiumsWrittenPropertyAndCasualty	151176000	USD
CY2009	us-gaap	Ceded Premiums Written Property And Casualty CededPremiumsWrittenPropertyAndCasualty	161284000	USD
CY2010	us-gaap	Premiums Written Net Property And Casualty PremiumsWrittenNetPropertyAndCasualty	485140000	USD
CY2009	us-gaap	Premiums Written Net Property And Casualty PremiumsWrittenNetPropertyAndCasualty	469916000	USD
CY2011	us-gaap	Direct Premiums Earned Property And Casualty DirectPremiumsEarnedPropertyAndCasualty	625963000	USD
CY2011	us-gaap	Assumed Premiums Earned Property And Casualty AssumedPremiumsEarnedPropertyAndCasualty	66984000	USD
CY2011	us-gaap	Ceded Premiums Earned Property And Casualty CededPremiumsEarnedPropertyAndCasualty	154495000	USD
CY2011	us-gaap	Premiums Earned Net Property And Casualty PremiumsEarnedNetPropertyAndCasualty	538452000	USD
CY2010	us-gaap	Direct Premiums Earned Property And Casualty DirectPremiumsEarnedPropertyAndCasualty	599669000	USD
CY2009	us-gaap	Direct Premiums Earned Property And Casualty DirectPremiumsEarnedPropertyAndCasualty	640034000	USD
CY2010	us-gaap	Assumed Premiums Earned Property And Casualty AssumedPremiumsEarnedPropertyAndCasualty	47637000	USD
CY2009	us-gaap	Assumed Premiums Earned Property And Casualty AssumedPremiumsEarnedPropertyAndCasualty	14289000	USD
CY2010	us-gaap	Ceded Premiums Earned Property And Casualty CededPremiumsEarnedPropertyAndCasualty	153924000	USD
CY2009	us-gaap	Ceded Premiums Earned Property And Casualty CededPremiumsEarnedPropertyAndCasualty	162362000	USD
CY2011	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	180768000	USD
CY2011	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	60076000	USD
CY2011	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	40760000	USD
CY2011	us-gaap	Incurred Claims Property Casualty And Liability IncurredClaimsPropertyCasualtyAndLiability	200084000	USD
CY2010	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	265903000	USD
CY2009	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	245671000	USD
CY2010	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	29586000	USD
CY2009	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	9696000	USD
CY2010	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	94157000	USD
CY2009	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	51979000	USD
CY2011Q4	rli	Prepaid Reinsurance Premiums And Recoverables On Losses And Settlement Expenses PrepaidReinsurancePremiumsAndRecoverablesOnLossesAndSettlementExpenses	389900000	USD
CY2011Q4	rli	Reinsurance Recoverable Number Of Top Reinsurers ReinsuranceRecoverableNumberOfTopReinsurers	10	reinsurer
CY2011Q4	us-gaap	Summary Of Investments Other Than Investments In Related Parties Cost SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost	1720410000	USD
CY2011Q4	us-gaap	Summary Of Investments Other Than Investments In Related Parties Fair Value SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue	1901043000	USD
CY2011Q4	us-gaap	Summary Of Investments Other Than Investments In Related Parties Carrying Amount SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount	1900288000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2122000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1359000	USD
CY2011	rli	Maximum Term Of Original Maturity Of Money Market Funds Included In Short Term Investments MaximumTermOfOriginalMaturityOfMoneyMarketFundsIncludedInShortTermInvestments	90	day
CY2011	dei	Entity Registrant Name EntityRegistrantName	RLI CORP
CY2011	dei	Entity Central Index Key EntityCentralIndexKey	0000084246
CY2011	dei	Document Type DocumentType	8-K
CY2011	dei	Document Period End Date DocumentPeriodEndDate	2011-12-31
CY2011	dei	Amendment Flag AmendmentFlag	false
CY2010	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	521000	USD
CY2009	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-6441000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	126598000	USD
CY2010	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	221000	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	356000	shares
CY2009	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	169000	shares
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	3577000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	264000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	11500000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	10000000	USD
CY2009	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	33500000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	128197000	USD
CY2009	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	92431000	USD
CY2008Q4	us-gaap	Liability For Claims And Claims Adjustment Expense Property Casualty Liability LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability	1159311000	USD
CY2008Q4	us-gaap	Reinsurance Receivables Incurred But Not Reported Claims ReinsuranceReceivablesIncurredButNotReportedClaims	350284000	USD
CY2009Q4	us-gaap	Reinsurance Receivables Incurred But Not Reported Claims ReinsuranceReceivablesIncurredButNotReportedClaims	336392000	USD
CY2010Q4	us-gaap	Reinsurance Receivables Incurred But Not Reported Claims ReinsuranceReceivablesIncurredButNotReportedClaims	354163000	USD
CY2011Q4	us-gaap	Reinsurance Receivables Incurred But Not Reported Claims ReinsuranceReceivablesIncurredButNotReportedClaims	353805000	USD
CY2008Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	809027000	USD
CY2009Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	810068000	USD
CY2010Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	819780000	USD
CY2011Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	796909000	USD
CY2011	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear	310145000	USD
CY2011	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears	-110061000	USD
CY2011	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims	200084000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear	284575000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears	-83243000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims	201332000	USD
CY2009	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear	269965000	USD
CY2009	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears	-66577000	USD
CY2009	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims	203388000	USD
CY2011	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear	89924000	USD
CY2011	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears	186537000	USD
CY2011	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid	276461000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear	43945000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears	147675000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid	191620000	USD
CY2009	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear	41890000	USD
CY2009	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears	160457000	USD
CY2009	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid	202347000	USD
CY2010	us-gaap	Income Taxes Paid IncomeTaxesPaid	52000000	USD
CY2009	us-gaap	Income Taxes Paid IncomeTaxesPaid	30800000	USD
CY2011	us-gaap	Income Taxes Paid IncomeTaxesPaid	50500000	USD
CY2010Q4	rli	Income Tax Reconciliation Rate Applicable To Dividends Received IncomeTaxReconciliationRateApplicableToDividendsReceived	0.07	pure
CY2009Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	211050	shares
CY2011	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	515317	shares
CY2009	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2900000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3500000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1200000	USD
CY2009Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	4100000	USD
CY2011Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	3600000	USD
CY2011	rli	Post Employment Benefits Medical Coverage Retirement Age Minimum PostEmploymentBenefitsMedicalCoverageRetirementAgeMinimum	55
CY2011	rli	Post Employment Benefits Medical Coverage Service Period Minimum PostEmploymentBenefitsMedicalCoverageServicePeriodMinimum	20
CY2011	rli	Post Employment Benefits Medical Coverage Termination Threshold Age PostEmploymentBenefitsMedicalCoverageTerminationThresholdAge	65
CY2011	rli	Number Of Insurance Companies Through Which Operations Conducted NumberOfInsuranceCompaniesThroughWhichOperationsConducted	4	company
CY2010	rli	Policy Acquisition Cost Amortization Expense And Direct Period Costs PolicyAcquisitionCostAmortizationExpenseAndDirectPeriodCosts	156894000	USD
CY2009	rli	Policy Acquisition Cost Amortization Expense And Direct Period Costs PolicyAcquisitionCostAmortizationExpenseAndDirectPeriodCosts	164195000	USD
CY2011Q4	rli	Capital And Operating Leases Future Minimum Payments Due In Five Years CapitalAndOperatingLeasesFutureMinimumPaymentsDueInFiveYears	1647000	USD
CY2011Q4	rli	Capital And Operating Leases Future Minimum Payments Due Thereafter CapitalAndOperatingLeasesFutureMinimumPaymentsDueThereafter	1694000	USD
CY2009	rli	Policy Acquisition Cost Contingent Ceding Commissions PolicyAcquisitionCostContingentCedingCommissions	1998000	USD
CY2010	rli	Policy Acquisition Cost Contingent Ceding Commissions PolicyAcquisitionCostContingentCedingCommissions	2203000	USD
CY2011	rli	Policy Acquisition Cost Contingent Ceding Commissions PolicyAcquisitionCostContingentCedingCommissions	2207000	USD
CY2009	rli	Policy Acquisition Costs Other Period Costs PolicyAcquisitionCostsOtherPeriodCosts	10715000	USD
CY2010	rli	Policy Acquisition Costs Other Period Costs PolicyAcquisitionCostsOtherPeriodCosts	7939000	USD
CY2011	rli	Policy Acquisition Costs Other Period Costs PolicyAcquisitionCostsOtherPeriodCosts	6884000	USD
CY2009	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	85982000	USD
CY2010	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	84128000	USD
CY2011	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	91499000	USD
CY2011Q1	us-gaap	Net Investment Income NetInvestmentIncome	16303000	USD
CY2011	us-gaap	Underwriting Income Loss UnderwritingIncomeLoss	110188000	USD
CY2011	rli	Other General And Interest Expenses OtherGeneralAndInterestExpenses	13816000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	6497000	USD
CY2010	us-gaap	Underwriting Income Loss UnderwritingIncomeLoss	96572000	USD
CY2010	rli	Other General And Interest Expenses OtherGeneralAndInterestExpenses	14048000	USD
CY2009	us-gaap	Underwriting Income Loss UnderwritingIncomeLoss	84610000	USD
CY2009	rli	Other General And Interest Expenses OtherGeneralAndInterestExpenses	13991000	USD
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CY2011Q2	us-gaap	Premiums Earned Net Property And Casualty PremiumsEarnedNetPropertyAndCasualty	130826000	USD
CY2011Q4	us-gaap	Premiums Earned Net Property And Casualty PremiumsEarnedNetPropertyAndCasualty	145023000	USD
CY2010Q1	us-gaap	Premiums Earned Net Property And Casualty PremiumsEarnedNetPropertyAndCasualty	116264000	USD
CY2010Q2	us-gaap	Premiums Earned Net Property And Casualty PremiumsEarnedNetPropertyAndCasualty	121758000	USD
CY2010Q3	us-gaap	Premiums Earned Net Property And Casualty PremiumsEarnedNetPropertyAndCasualty	128334000	USD
CY2011Q3	us-gaap	Net Investment Income NetInvestmentIncome	15954000	USD
CY2011Q4	us-gaap	Net Investment Income NetInvestmentIncome	16244000	USD
CY2010Q1	us-gaap	Net Investment Income NetInvestmentIncome	16600000	USD
CY2010Q2	us-gaap	Net Investment Income NetInvestmentIncome	16765000	USD
CY2010Q4	us-gaap	Net Investment Income NetInvestmentIncome	16672000	USD
CY2011Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	67730000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	34907000	USD
CY2011Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	40128000	USD
CY2010Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	36272000	USD
CY2010Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	51081000	USD
CY2010Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	41433000	USD
CY2010Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	50881000	USD
CY2011Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	27706000	USD
CY2011Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	44992000	USD
CY2011Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	23969000	USD
CY2011Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	29931000	USD
CY2010Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	25177000	USD
CY2010Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	34248000	USD
CY2010Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	28244000	USD
CY2010Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	40528000	USD
CY2011Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.32
CY2011Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.13
CY2011Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.14
CY2011Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.42
CY2010Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.19
CY2010Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.63
CY2010Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.35
CY2010Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.93
CY2011Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.30
CY2011Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.11
CY2011Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.12
CY2011Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.39
CY2010Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.18
CY2010Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.61
CY2010Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.34
CY2010Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.91
CY2011Q4	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.40	pure
CY2011Q4	rli	Investments In Debt And Equity Securities Number Of Categories InvestmentsInDebtAndEquitySecuritiesNumberOfCategories	3	category
CY2011	rli	Unrealized Gains Losses On Marketable Securities Cost Method Investments And Other Investments UnrealizedGainsLossesOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments	32855000	USD
CY2011	rli	Realized And Unrealized Gain Loss On Investments RealizedAndUnrealizedGainLossOnInvestments	49891000	USD
CY2010	rli	Realized And Unrealized Gain Loss On Investments RealizedAndUnrealizedGainLossOnInvestments	51938000	USD
CY2009	rli	Realized And Unrealized Gain Loss On Investments RealizedAndUnrealizedGainLossOnInvestments	82526000	USD
CY2010Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	1306938000	USD
CY2010Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	1453961000	USD
CY2010Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	155358000	USD
CY2010Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	8335000	USD
CY2010Q4	us-gaap	Heldtomaturity Securities Unrecognized Holding Gain HeldtomaturitySecuritiesUnrecognizedHoldingGain	939000	USD
CY2010Q4	us-gaap	Held To Maturity Securities Unrecognized Holding Loss HeldToMaturitySecuritiesUnrecognizedHoldingLoss	6813000	USD
CY2010Q4	us-gaap	Trading Securities Cost TradingSecuritiesCost	13000	USD
CY2010Q4	us-gaap	Trading Securities Fair Value Disclosure TradingSecuritiesFairValueDisclosure	15000	USD
CY2010Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	1616209000	USD
CY2010Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	1757360000	USD
CY2010	rli	Investments Gross Unrealized Gain InvestmentsGrossUnrealizedGain	156297000	USD
CY2010	rli	Investments Gross Unrealized Losses InvestmentsGrossUnrealizedLosses	15148000	USD
CY2011Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	1355128000	USD
CY2011Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	1535006000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	186067000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	6189000	USD
CY2011Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	260226000	USD
CY2011Q4	us-gaap	Heldtomaturity Securities Unrecognized Holding Gain HeldtomaturitySecuritiesUnrecognizedHoldingGain	1219000	USD
CY2011Q4	us-gaap	Held To Maturity Securities Unrecognized Holding Loss HeldToMaturitySecuritiesUnrecognizedHoldingLoss	464000	USD
CY2011Q4	us-gaap	Trading Securities Fair Value Disclosure TradingSecuritiesFairValueDisclosure	7000	USD
CY2011Q4	us-gaap	Investment Owned At Cost InvestmentOwnedAtCost	1615361000	USD
CY2011Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	1795994000	USD
CY2011	rli	Investments Gross Unrealized Gain InvestmentsGrossUnrealizedGain	187286000	USD
CY2011	rli	Investments Gross Unrealized Losses InvestmentsGrossUnrealizedLosses	6653000	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	11716000	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	125067000	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	501379000	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	160107000	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	11895000	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	131826000	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	531527000	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	165130000	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1146317000	USD
CY2011Q4	us-gaap	Held To Maturity Securities Debt Maturities Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmount	260226000	USD
CY2011Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	2001000	USD
CY2011Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	3632000	USD
CY2011Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	16793000	USD
CY2011Q4	rli	Investment Continuous Unrealized Loss Position Twelve Months Or Longer Amortized Cost InvestmentContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost	31419000	USD
CY2011Q4	rli	Investment Continuous Unrealized Loss Position Amortized Cost InvestmentContinuousUnrealizedLossPositionAmortizedCost	116840000	USD
CY2011Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	2058000	USD
CY2011Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	3927000	USD
CY2011Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	16837000	USD
CY2011Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	238159000	USD
CY2011Q4	us-gaap	Held To Maturity Securities Debt Maturities Fair Value HeldToMaturitySecuritiesDebtMaturitiesFairValue	260981000	USD
CY2011Q4	us-gaap	Trading Securities Cost TradingSecuritiesCost	7000	USD
CY2011Q4	rli	Investments Debt Maturities Within One Year Amortized Cost InvestmentsDebtMaturitiesWithinOneYearAmortizedCost	13717000	USD
CY2011Q4	rli	Investments Debt Maturities After One Through Five Years Amortized Cost InvestmentsDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	128699000	USD
CY2011Q4	rli	Investments Debt Maturities After Five Through Ten Years Amortized Cost InvestmentsDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	518172000	USD
CY2011Q4	rli	Investments Debt Maturities After Ten Years Amortized Cost InvestmentsDebtMaturitiesAfterTenYearsAmortizedCost	397907000	USD
CY2011Q4	rli	Investments Debt At Cost InvestmentsDebtAtCost	1345961000	USD
CY2011Q4	rli	Investments Debt Maturities Within One Year Fair Value InvestmentsDebtMaturitiesWithinOneYearFairValue	13953000	USD
CY2011Q4	rli	Investments Debt Maturities After One Through Five Years Fair Value InvestmentsDebtMaturitiesAfterOneThroughFiveYearsFairValue	135753000	USD
CY2011Q4	rli	Investments Debt Maturities After Five Through Ten Years Fair Value InvestmentsDebtMaturitiesAfterFiveThroughTenYearsFairValue	548364000	USD
CY2011Q4	rli	Investments Debt Maturities After Ten Years Fair Value InvestmentsDebtMaturitiesAfterTenYearsFairValue	403289000	USD
CY2011Q4	rli	Investments Debt Fair Value Disclosure InvestmentsDebtFairValueDisclosure	1407305000	USD
CY2010Q4	us-gaap	Available For Sale Securities Gross Unrealized Gain Loss AvailableForSaleSecuritiesGrossUnrealizedGainLoss	147000000	USD
CY2009Q4	us-gaap	Available For Sale Securities Gross Unrealized Gain Loss AvailableForSaleSecuritiesGrossUnrealizedGainLoss	118300000	USD
CY2010Q4	rli	Investment Continuous Unrealized Loss Position Less Than Twelve Months Fair Value InvestmentContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	544913000	USD
CY2010Q4	rli	Investment Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value InvestmentContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	2947000	USD
CY2010Q4	rli	Investment Continuous Unrealized Loss Position Fair Value InvestmentContinuousUnrealizedLossPositionFairValue	547860000	USD
CY2010Q4	rli	Investment Continuous Unrealized Loss Position Less Than Twelve Months Amortized Cost InvestmentContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost	559946000	USD
CY2010Q4	rli	Investment Continuous Unrealized Loss Position Twelve Months Or Longer Amortized Cost InvestmentContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost	3062000	USD
CY2010Q4	rli	Investment Continuous Unrealized Loss Position Amortized Cost InvestmentContinuousUnrealizedLossPositionAmortizedCost	563008000	USD
CY2010Q4	rli	Investment Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses InvestmentContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses	15033000	USD
CY2010Q4	rli	Investment Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses InvestmentContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	115000	USD
CY2010Q4	rli	Investment Continuous Unrealized Loss Position Aggregate Losses InvestmentContinuousUnrealizedLossPositionAggregateLosses	15148000	USD
CY2011Q4	rli	Investment Continuous Unrealized Loss Position Less Than Twelve Months Fair Value InvestmentContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	80439000	USD
CY2011Q4	rli	Investment Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value InvestmentContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	29748000	USD
CY2011Q4	rli	Investment Continuous Unrealized Loss Position Fair Value InvestmentContinuousUnrealizedLossPositionFairValue	110187000	USD
CY2011Q4	rli	Investment Continuous Unrealized Loss Position Less Than Twelve Months Amortized Cost InvestmentContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost	85421000	USD
CY2011Q4	rli	Investment Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses InvestmentContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses	4982000	USD
CY2011Q4	rli	Investment Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses InvestmentContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	1671000	USD
CY2011Q4	rli	Investment Continuous Unrealized Loss Position Aggregate Losses InvestmentContinuousUnrealizedLossPositionAggregateLosses	6653000	USD
CY2011Q4	us-gaap	Restricted Investments RestrictedInvestments	23200000	USD
CY2011	us-gaap	Realized Gain Loss On Marketable Securities Cost Method Investments And Other Investments RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments	17036000	USD
CY2010	us-gaap	Realized Gain Loss On Marketable Securities Cost Method Investments And Other Investments RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments	23243000	USD
CY2009	us-gaap	Realized Gain Loss On Marketable Securities Cost Method Investments And Other Investments RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments	-12755000	USD
CY2011Q4	rli	Minimum Percentage Of Reinsurance Recoverables From Entities With Financial Strength Ratings Of A Or Better MinimumPercentageOfReinsuranceRecoverablesFromEntitiesWithFinancialStrengthRatingsOfAOrBetter	0.95	pure
CY2011Q4	rli	Threshold Reinsurance Recoverable From Individual Reinsurer As Percentage Of Shareholders Equity ThresholdReinsuranceRecoverableFromIndividualReinsurerAsPercentageOfShareholdersEquity	0.02	pure
CY2011Q4	rli	Reinsurance Receivables Threshold Period ReinsuranceReceivablesThresholdPeriod	1
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	8746000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	5496000	USD
CY2011Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	102707000	USD
CY2010Q4	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	7900000	USD
CY2008Q3	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	4000000	USD
CY2011	rli	Effective Income Tax Rate Continuing Operations Anticipated On Reversal Of Deferred Items EffectiveIncomeTaxRateContinuingOperationsAnticipatedOnReversalOfDeferredItems	0.35	pure
CY2011Q1	us-gaap	Realized Gain Loss On Marketable Securities Cost Method Investments And Other Investments RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments	4472000	USD
CY2011Q2	us-gaap	Realized Gain Loss On Marketable Securities Cost Method Investments And Other Investments RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments	10050000	USD
CY2011Q3	us-gaap	Realized Gain Loss On Marketable Securities Cost Method Investments And Other Investments RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments	-177000	USD
CY2011Q4	us-gaap	Realized Gain Loss On Marketable Securities Cost Method Investments And Other Investments RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments	2691000	USD
CY2010Q1	us-gaap	Realized Gain Loss On Marketable Securities Cost Method Investments And Other Investments RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments	6463000	USD
CY2011	us-gaap	Interest Expense Debt InterestExpenseDebt	6050000	USD
CY2011	rli	Employee Stock Ownership Plan Esop Tax Benefit Of Special Dividends Paid To Plan EmployeeStockOwnershipPlanESOPTaxBenefitOfSpecialDividendsPaidToPlan	2700000	USD
CY2011	rli	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Special Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanSpecialDividends	0.015	pure
CY2010Q4	rli	Common Stock Special Dividends Per Share Declared CommonStockSpecialDividendsPerShareDeclared	7.00
CY2011Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	201000	shares
CY2010Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	13.42
CY2010Q2	us-gaap	Realized Gain Loss On Marketable Securities Cost Method Investments And Other Investments RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments	4291000	USD
CY2010Q3	us-gaap	Realized Gain Loss On Marketable Securities Cost Method Investments And Other Investments RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments	4527000	USD
CY2010Q4	us-gaap	Realized Gain Loss On Marketable Securities Cost Method Investments And Other Investments RealizedGainLossOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments	7962000	USD
CY2010Q4	us-gaap	Supplementary Insurance Information Liability For Future Policy Benefits Losses Claims And Loss Expense Reserves SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves	1173943000	USD
CY2011Q4	us-gaap	Supplementary Insurance Information Liability For Future Policy Benefits Losses Claims And Loss Expense Reserves SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves	1150714000	USD
CY2009Q4	us-gaap	Supplementary Insurance Information Liability For Future Policy Benefits Losses Claims And Loss Expense Reserves SupplementaryInsuranceInformationLiabilityForFuturePolicyBenefitsLossesClaimsAndLossExpenseReserves	1146460000	USD
CY2011	rli	Incentive Plans Bonus Expense IncentivePlansBonusExpense	17400000	USD
CY2009	rli	Incentive Plans Bonus Expense IncentivePlansBonusExpense	15500000	USD
CY2010	rli	Incentive Plans Bonus Expense IncentivePlansBonusExpense	16000000	USD
CY2011	rli	Share Based Compensation Arrangement By Share Based Payment Award Options Special Dividend Adjustment ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSpecialDividendAdjustment	1541	shares
CY2010	rli	Share Based Compensation Arrangement By Share Based Payment Award Options Special Dividend Adjustment ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSpecialDividendAdjustment	5398	shares
CY2011Q4	rli	Share Based Compensation Arrangement By Share Based Payment Award Options Special Dividend Adjustment Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSpecialDividendAdjustmentWeightedAverageExercisePrice	32.16
CY2010Q4	rli	Share Based Compensation Arrangement By Share Based Payment Award Options Special Dividend Adjustment Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSpecialDividendAdjustmentWeightedAverageExercisePrice	34.25
CY2010Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	21962000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	37867000	USD
CY2011Q4	rli	Deferred Tax Liabilities Unrealized Gains On Securities DeferredTaxLiabilitiesUnrealizedGainsOnSecurities	63274000	USD
CY2010Q4	rli	Deferred Tax Liabilities Unrealized Gains On Securities DeferredTaxLiabilitiesUnrealizedGainsOnSecurities	51544000	USD
CY2010	rli	Employee Stock Ownership Plan Esop Tax Benefit Of Special Dividends Paid To Plan EmployeeStockOwnershipPlanESOPTaxBenefitOfSpecialDividendsPaidToPlan	3600000	USD
CY2010	rli	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Special Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanSpecialDividends	0.02	pure
CY2011Q4	rli	Common Stock Special Dividends Per Share Declared CommonStockSpecialDividendsPerShareDeclared	5.00
CY2011Q4	rli	Reinsurance Recoverables Unpaid Losses Allowances ReinsuranceRecoverablesUnpaidLossesAllowances	14820000	USD
CY2010Q4	rli	Reinsurance Recoverables Unpaid Losses Allowances ReinsuranceRecoverablesUnpaidLossesAllowances	15065000	USD
CY2011Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	237800000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Gain Loss AvailableForSaleSecuritiesGrossUnrealizedGainLoss	179900000	USD
CY2010Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	167150	shares
CY2011	rli	Increase Decrease In Segment Revenue Due To Reclassification Of Business Division IncreaseDecreaseInSegmentRevenueDueToReclassificationOfBusinessDivision	800000	USD
CY2011	rli	Increase Decrease In Segment Net Earnings Due To Reclassification Of Business Division IncreaseDecreaseInSegmentNetEarningsDueToReclassificationOfBusinessDivision	-1100000	USD
CY2011Q4	rli	Goodwill And Intangibles GoodwillAndIntangibles	60482000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	600000	USD
CY2011	us-gaap	Operating Expenses OperatingExpenses	44312000	USD
CY2011	rli	Cost Of Services Insurance Expenses CostOfServicesInsuranceExpenses	428264000	USD
CY2010	rli	Cost Of Services Insurance Expenses CostOfServicesInsuranceExpenses	396810000	USD
CY2009	rli	Cost Of Services Insurance Expenses CostOfServicesInsuranceExpenses	407351000	USD
CY2011Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	7000	USD
CY2011Q4	us-gaap	Marketable Securities Equity Securities MarketableSecuritiesEquitySecurities	388689000	USD
CY2011Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	23865000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	81184000	USD
CY2011Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	13865000	USD
CY2011Q4	rli	Premiums And Reinsurance Balances Receivable PremiumsAndReinsuranceBalancesReceivable	124496000	USD
CY2011Q4	us-gaap	Prepaid Reinsurance Premiums PrepaidReinsurancePremiums	61629000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	20104000	USD
CY2011Q4	us-gaap	Equity Method Investments EquityMethodInvestments	49968000	USD
CY2011Q4	us-gaap	Other Assets OtherAssets	18092000	USD
CY2011Q4	us-gaap	Unearned Premiums UnearnedPremiums	341267000	USD
CY2011Q4	us-gaap	Reinsurance Payable ReinsurancePayable	50861000	USD
CY2011Q4	rli	Funds Held FundsHeld	110555000	USD
CY2010Q4	rli	Funds Held FundsHeld	32072000	USD
CY2011Q4	us-gaap	Long Term Debt LongTermDebt	100000000	USD
CY2010Q4	us-gaap	Value Of Business Acquired Voba ValueOfBusinessAcquiredVOBA	10822000	USD
CY2011	us-gaap	Amortization Of Value Of Business Acquired Voba AmortizationOfValueOfBusinessAcquiredVOBA	7670000	USD
CY2011Q4	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	58883000	USD
CY2011Q4	us-gaap	Other Liabilities OtherLiabilities	12053000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	32627000	USD
CY2011Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	227788000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	117325000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	807893000	USD
CY2011Q4	us-gaap	Common Stock Issued Employee Stock Trust CommonStockIssuedEmployeeStockTrust	-10445000	USD
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	403444000	USD
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	21162137	shares
CY2010Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	20964540	shares
CY2011	us-gaap	Impairment Of Investments ImpairmentOfInvestments	257000	USD
CY2011	us-gaap	Other General Expense OtherGeneralExpense	7766000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	49524000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7464000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	32230000	USD
CY2011	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	10897000	USD
CY2011	rli	Comprehensive Earnings Per Share Basic ComprehensiveEarningsPerShareBasic	7.02
CY2011	rli	Comprehensive Earnings Per Share Diluted ComprehensiveEarningsPerShareDiluted	6.90
CY2011	us-gaap	Depreciation Depreciation	3177000	USD
CY2011	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	9144000	USD
CY2011	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	-2577000	USD
CY2011	rli	Increase Decrease In Premiums And Reinsurance Receivable IncreaseDecreaseInPremiumsAndReinsuranceReceivable	-14303000	USD
CY2011	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	27010000	USD
CY2011	rli	Increase Decrease In Funds Held IncreaseDecreaseInFundsHeld	-78483000	USD
CY2010	rli	Increase Decrease In Funds Held IncreaseDecreaseInFundsHeld	5618000	USD
CY2009	rli	Increase Decrease In Funds Held IncreaseDecreaseInFundsHeld	-4731000	USD
CY2011	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	-2025000	USD
CY2011	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	-358000	USD
CY2011	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	1041000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-17619000	USD
CY2011	us-gaap	Increase Decrease In Property And Casualty Insurance Liabilities IncreaseDecreaseInPropertyAndCasualtyInsuranceLiabilities	-95616000	USD
CY2011	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	8593000	USD
CY2011	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-1440000	USD
CY2011	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	4210000	USD
CY2011	us-gaap	Proceeds From Payments For Trading Securities ProceedsFromPaymentsForTradingSecurities	6000	USD
CY2011	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	209300000	USD
CY2011	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	450813000	USD
CY2011	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	87346000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5382000	USD
CY2011	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	120767000	USD
CY2011	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	383664000	USD
CY2011	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	40092000	USD
CY2011	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	15922000	USD
CY2011	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1424000	USD
CY2011	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	258493000	USD
CY2011	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	261654000	USD
CY2011	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	4210000	USD
CY2011	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	8821000	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	6624000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	130855000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	0	USD
CY2011	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	81184000	USD
CY2011Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	5.00
CY2010Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	7.00
CY2011Q2	us-gaap	Liability For Claims And Claims Adjustment Expense Property Casualty Liability LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiability	72387000	USD
CY2011Q2	us-gaap	Reinsurance Receivables Incurred But Not Reported Claims ReinsuranceReceivablesIncurredButNotReportedClaims	18881000	USD
CY2011Q2	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	53506000	USD
CY2011	rli	Deferred Policy Acquisition Cost Amortization Expense Total DeferredPolicyAcquisitionCostAmortizationExpenseTotal	99169000	USD
CY2010	rli	Deferred Policy Acquisition Cost Amortization Expense Total DeferredPolicyAcquisitionCostAmortizationExpenseTotal	84128000	USD
CY2009	rli	Deferred Policy Acquisition Cost Amortization Expense Total DeferredPolicyAcquisitionCostAmortizationExpenseTotal	85982000	USD
CY2011	us-gaap	Realized Gain Loss On Marketable Securities And Cost Method Investments Excluding Other Than Temporary Impairments And Other Investments RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments	17293000	USD
CY2010	us-gaap	Realized Gain Loss On Marketable Securities And Cost Method Investments Excluding Other Than Temporary Impairments And Other Investments RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments	23243000	USD
CY2009	us-gaap	Realized Gain Loss On Marketable Securities And Cost Method Investments Excluding Other Than Temporary Impairments And Other Investments RealizedGainLossOnMarketableSecuritiesAndCostMethodInvestmentsExcludingOtherThanTemporaryImpairmentsAndOtherInvestments	32538000	USD
CY2011	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	68298000	USD
CY2011	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	4617000	USD
CY2011	us-gaap	Net Investment Income NetInvestmentIncome	63681000	USD
CY2010	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	71168000	USD
CY2010	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	4369000	USD
CY2009	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	71660000	USD
CY2009	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	4314000	USD
CY2009	rli	Unrealized Gains Losses On Marketable Securities Cost Method Investments And Other Investments UnrealizedGainsLossesOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments	95281000	USD
CY2010	rli	Unrealized Gains Losses On Marketable Securities Cost Method Investments And Other Investments UnrealizedGainsLossesOnMarketableSecuritiesCostMethodInvestmentsAndOtherInvestments	28695000	USD

Files In Submission

Name	View Source	Status
0001104659-12-084665-index-headers.html	Edgar Link	pending
0001104659-12-084665-index.html	Edgar Link	pending
0001104659-12-084665.txt	Edgar Link	pending
0001104659-12-084665-xbrl.zip	Edgar Link	pending
a12-28448_18k.htm	Edgar Link	pending
a12-28448_1ex23.htm	Edgar Link	pending
a12-28448_1ex99d1.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
R1.htm	Edgar Link	pending
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report.css	Edgar Link	pending
rli-20111231.xml	Edgar Link	completed
rli-20111231.xsd	Edgar Link	pending
rli-20111231_cal.xml	Edgar Link	unprocessable
rli-20111231_def.xml	Edgar Link	unprocessable
rli-20111231_lab.xml	Edgar Link	unprocessable
rli-20111231_pre.xml	Edgar Link	unprocessable
Show.js	Edgar Link	pending

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$RLI
RLI Corp Stock $rli

2010 Q4 Form 8-K Financial Statement

#000110465912084665 Filed on December 17, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$RLI RLI Corp Stock $rli

2010 Q4 Form 8-K Financial Statement

#000110465912084665 Filed on December 17, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$RLI
RLI Corp Stock $rli