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Investments (Details 10) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Available-for-sale Securities [Abstract]      
Other-than-temporary impairments on fixed maturity securities $ (15,908,000) $ (30,873,000) $ (31,920,000)
Other Than Temporary Impairments On Fixed Maturity Securities Transferred To Other Comprehensive Loss (7,618,000) 3,924,000 2,045,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net (23,526,000) (26,949,000) (29,875,000)
Impairment Losses On Equity Securities (3,025,000) (4,116,000) (32,000)
Available-for-sale Securities, Gross Realized Gains 145,268,000 132,045,000 100,957,000
Available-for-sale Securities, Gross Realized Losses (27,474,000) (26,996,000) (28,730,000)
Other Impairment Losses And Change In Mortgage Loan Provision (16,602,000) (10,238,000) (5,976,000)
Deriviatives And Other Investments Net 179,495,000 (99,802,000) 175,686,000
Realized Investment Gains (Losses) $ 254,136,000 $ (36,056,000) $ 212,030,000