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Quarterly Financial Information (Summary Of Quarterly Financial Information) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Financial Data [Abstract]                      
Net premiums earned $ 709,368us-gaap_PremiumsEarnedNet $ 705,237us-gaap_PremiumsEarnedNet $ 697,889us-gaap_PremiumsEarnedNet $ 683,701us-gaap_PremiumsEarnedNet $ 680,892us-gaap_PremiumsEarnedNet $ 678,913us-gaap_PremiumsEarnedNet $ 675,787us-gaap_PremiumsEarnedNet $ 662,595us-gaap_PremiumsEarnedNet $ 2,796,195us-gaap_PremiumsEarnedNet $ 2,698,187us-gaap_PremiumsEarnedNet $ 2,574,920us-gaap_PremiumsEarnedNet
Change in fair value of investments pursuant to the fair value option (22,824)us-gaap_FairValueOptionChangesInFairValueGainLoss1 (20,528)us-gaap_FairValueOptionChangesInFairValueGainLoss1 41,412us-gaap_FairValueOptionChangesInFairValueGainLoss1 45,699us-gaap_FairValueOptionChangesInFairValueGainLoss1 (30,593)us-gaap_FairValueOptionChangesInFairValueGainLoss1 21,815us-gaap_FairValueOptionChangesInFairValueGainLoss1 (78,726)us-gaap_FairValueOptionChangesInFairValueGainLoss1 43,467us-gaap_FairValueOptionChangesInFairValueGainLoss1 43,759us-gaap_FairValueOptionChangesInFairValueGainLoss1 (44,037)us-gaap_FairValueOptionChangesInFairValueGainLoss1 45,509us-gaap_FairValueOptionChangesInFairValueGainLoss1
Income (loss) before income taxes (28,161)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 37,120us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 136,436us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 102,030us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 11,268us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 54,793us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (24,959)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 90,994us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 247,425us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 132,096us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 135,310us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net income $ (20,956)us-gaap_NetIncomeLoss $ 31,296us-gaap_NetIncomeLoss $ 94,960us-gaap_NetIncomeLoss $ 72,649us-gaap_NetIncomeLoss $ 15,376us-gaap_NetIncomeLoss $ 39,570us-gaap_NetIncomeLoss $ (9,264)us-gaap_NetIncomeLoss $ 66,461us-gaap_NetIncomeLoss $ 177,949us-gaap_NetIncomeLoss $ 112,143us-gaap_NetIncomeLoss $ 116,911us-gaap_NetIncomeLoss
Basic (in dollars per share) $ (0.38)us-gaap_EarningsPerShareBasic [1] $ 0.57us-gaap_EarningsPerShareBasic [1] $ 1.73us-gaap_EarningsPerShareBasic [1] $ 1.32us-gaap_EarningsPerShareBasic [1] $ 0.28us-gaap_EarningsPerShareBasic $ 0.72us-gaap_EarningsPerShareBasic $ (0.17)us-gaap_EarningsPerShareBasic $ 1.21us-gaap_EarningsPerShareBasic $ 3.23us-gaap_EarningsPerShareBasic $ 2.04us-gaap_EarningsPerShareBasic $ 2.13us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ (0.38)us-gaap_EarningsPerShareDiluted [1],[2] $ 0.57us-gaap_EarningsPerShareDiluted [1] $ 1.73us-gaap_EarningsPerShareDiluted [1] $ 1.32us-gaap_EarningsPerShareDiluted [1] $ 0.28us-gaap_EarningsPerShareDiluted $ 0.72us-gaap_EarningsPerShareDiluted $ (0.17)us-gaap_EarningsPerShareDiluted [2] $ 1.21us-gaap_EarningsPerShareDiluted $ 3.23us-gaap_EarningsPerShareDiluted $ 2.04us-gaap_EarningsPerShareDiluted $ 2.13us-gaap_EarningsPerShareDiluted
Dividends paid per share $ 0.6175us-gaap_DividendsPayableAmountPerShare $ 0.6175us-gaap_DividendsPayableAmountPerShare $ 0.6150us-gaap_DividendsPayableAmountPerShare $ 0.6150us-gaap_DividendsPayableAmountPerShare $ 0.6150us-gaap_DividendsPayableAmountPerShare $ 0.6125us-gaap_DividendsPayableAmountPerShare $ 0.6125us-gaap_DividendsPayableAmountPerShare $ 0.6125us-gaap_DividendsPayableAmountPerShare $ 0.6175us-gaap_DividendsPayableAmountPerShare $ 0.6150us-gaap_DividendsPayableAmountPerShare  
[1] The basic and diluted earnings per share do not sum due to rounding.
[2] The dilutive impact of incremental shares is excluded from net loss position in accordance with GAAP.