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Investments Net Realized Gains/Losses on Invesments, Excluding Other Than Temporary Impairments (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Gain (Loss) on Investments [Line Items]        
Net realized gains on investments, excluding other than temporary impairment (OTTI) losses $ (1,238,000) $ (17,292,000) $ (7,925,000) $ (19,339,000)
Fixed Maturities - Available for Sale     1,942,533,000 3,433,977,000
Fixed Maturities [Member]
        
Gain (Loss) on Investments [Line Items]        
Proceeds from Sale of Available-for-sale Securities     276,100,000 144,400,000
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments 2,848,000 169,000 7,541,000 3,288,000
Fixed Maturities - Available for Sale     1,600,000,000 3,300,000,000
Equity Securities [Member]
        
Gain (Loss) on Investments [Line Items]        
Available-for-sale Securities, Gross Realized Gains 0 0 562,000 966,000
Other Investments [Member]
        
Gain (Loss) on Investments [Line Items]        
Gains (Losses) on Sales of Other Real Estate (53,000) 0 (2,948,000) 0
Other Investments, Impairment Losses (830,000) 0 (3,473,000) (12,000)
Net Realized Gain (Loss) on Other Investments (777,000) 0 (525,000) (12,000)
Mortgage Loans on Real Estate [Member]
        
Gain (Loss) on Investments [Line Items]        
Mortgage Loans on Real Estate, Write-down or Reserve, Amount (3,309,000) (17,461,000) (15,503,000) (23,581,000)
Fixed Maturities [Member] | Fixed Maturities [Member]
        
Gain (Loss) on Investments [Line Items]        
Available-for-sale Securities, Gross Realized Gains 3,028,000 169,000 8,076,000 4,711,000
Available-for-sale Securities, Gross Realized Losses $ 180,000 $ 0 $ 535,000 $ 1,423,000