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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 26,165us-gaap_NetIncomeLoss	$ 72,649us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,107us-gaap_DepreciationAmortizationAndAccretionNet	6,760us-gaap_DepreciationAmortizationAndAccretionNet
Net realized investment losses (gains)	9,961us-gaap_RealizedInvestmentGainsLosses	(46,712)us-gaap_RealizedInvestmentGainsLosses
Bond amortization, net	5,213us-gaap_AmortizationOfDebtDiscountPremium	4,153us-gaap_AmortizationOfDebtDiscountPremium
Excess tax benefit from exercise of stock options	(82)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	0us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Increase in premiums receivables	(22,214)us-gaap_IncreaseDecreaseInPremiumsReceivable	(26,448)us-gaap_IncreaseDecreaseInPremiumsReceivable
Change in current and deferred income taxes	(6,102)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes	10,643us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Increase in deferred policy acquisition costs	(1,899)us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts	(6,852)us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts
(Decrease) increase in unpaid losses and loss adjustment expenses	(4,597)us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve	5,061us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve
Increase in unearned premiums	18,866us-gaap_IncreaseDecreaseInUnearnedPremiums	39,995us-gaap_IncreaseDecreaseInUnearnedPremiums
Decrease in accounts payable and accrued expenses	(38,258)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	(13,626)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Share-based compensation	1,043us-gaap_ShareBasedCompensation	398us-gaap_ShareBasedCompensation
Changes in other payables	7,543us-gaap_IncreaseDecreaseInOtherAccountsPayable	(6,820)us-gaap_IncreaseDecreaseInOtherAccountsPayable
Other, net	8,706us-gaap_IncreaseDecreaseInOtherOperatingLiabilities	10,245us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash provided by operating activities	11,452us-gaap_NetCashProvidedByUsedInOperatingActivities	49,446us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES
Fixed maturities available-for-sale in nature: Purchases	(374,582)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt	(177,508)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt
Fixed maturities available-for-sale in nature: Sales	16,733us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	73,911us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
Fixed maturities available-for-sale in nature: Calls or maturities	87,365us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	59,633us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Equity securities available-for-sale in nature:
Purchases	(246,085)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesEquity	(242,958)us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesEquity
Sales	267,175us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	157,453us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
Changes in securities payable and receivable	13,638us-gaap_IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet	(678)us-gaap_IncreaseDecreaseInBrokerDealerRelatedReceivablesPayablesNet
Net decrease in short-term investments and purchased options	198,620us-gaap_ProceedsFromSaleOfShortTermInvestments	12,206us-gaap_ProceedsFromSaleOfShortTermInvestments
Purchase of fixed assets	(5,928)us-gaap_PaymentsToAcquireProductiveAssets	(6,445)us-gaap_PaymentsToAcquireProductiveAssets
Sale of fixed assets	58us-gaap_ProceedsFromSaleOfProductiveAssets	151us-gaap_ProceedsFromSaleOfProductiveAssets
Business acquisition, net of cash acquired	7,771us-gaap_CashAcquiredFromAcquisition	0us-gaap_CashAcquiredFromAcquisition
Other, net	1,142us-gaap_PaymentsForProceedsFromOtherInvestingActivities	840us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities	(34,093)us-gaap_NetCashProvidedByUsedInInvestingActivities	(123,395)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid to shareholders	(34,055)us-gaap_PaymentsOfDividendsCommonStock	(33,811)us-gaap_PaymentsOfDividendsCommonStock
Excess tax benefit from exercise of stock options	82us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Proceeds from stock options exercised	1,283us-gaap_ProceedsFromStockOptionsExercised	84us-gaap_ProceedsFromStockOptionsExercised
Proceeds from bank loan	0us-gaap_ProceedsFromBankDebt	80,000us-gaap_ProceedsFromBankDebt
Net cash (used in) provided by financing activities	(32,690)us-gaap_NetCashProvidedByUsedInFinancingActivities	46,273us-gaap_NetCashProvidedByUsedInFinancingActivities
Net decrease in cash	(55,331)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	(27,676)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash:
Beginning of the year	289,907us-gaap_Cash	266,508us-gaap_Cash
End of period	234,576us-gaap_Cash	238,832us-gaap_Cash
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	692us-gaap_InterestPaid	477us-gaap_InterestPaid
Income taxes paid	$ 9,798us-gaap_IncomeTaxesPaid	$ 18,737us-gaap_IncomeTaxesPaid

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