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Investments Schedule of Components of Net Investment Income (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Investment Income, Reported Amounts, by Category [Line Items]      
Net Investment Income, Insurance Entity, Fixed Maturities $ 1,112,296,000 $ 1,048,376,000 $ 875,894,000
Net Investment Income, Insurance Entity, Equity Securities 3,090,000 3,315,000 5,299,000
Net Investment Income, Insurance Entity, Mortgage Loans on Real Estate 176,354,000 172,731,000 159,193,000
Net Investment Income, Isurance Entity, Cash and Cash Equivalents 2,243,000 554,000 621,000
Net Investment Income, Insurance Entity, Other Long-term Investments 6,348,000 4,020,000 1,636,000
Net Investment Income, Insurance Entity, Gross 1,300,331,000 1,228,996,000 1,042,643,000
Net Investment Income, Insurance Entity, Investment Expenses (13,408,000) (10,216,000) (6,537,000)
Net Investment Income, Insurance Entity 1,286,923,000 1,218,780,000 1,036,106,000
Proceeds from Sale, Maturity and Collection of Investments [Abstract]      
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities 3,298,623,000 3,705,605,000 4,568,499,000
Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities 2,618,207,000 219,372,000 1,585,267,000
Fixed Maturities [Member]
      
Proceeds from Sale, Maturity and Collection of Investments [Abstract]      
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities 2,800,000,000 3,400,000,000 4,100,000,000
Proceeds from Sale of Available-for-sale Securities $ 492,500,000 $ 252,200,000 $ 340,600,000