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Investments (Components of Net Investment Income) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Investment Income, Reported Amounts, by Category [Line Items]                      
Investment income, gross                 $ 1,397,327 $ 1,300,331 $ 1,228,996
Less investment expenses                 (13,400) (13,408) (10,216)
Net investment income 363,947 354,147 336,143 329,690 321,160 318,594 320,259 326,910 1,383,927 1,286,923 1,218,780
Fixed Maturity Securities [Member]
                     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]                      
Investment income, gross                 1,229,486 1,112,296 1,048,376
Equity Securities [Member]
                     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]                      
Investment income, gross                 1,586 3,090 3,315
Mortgage Loans on Real Estate [Member]
                     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]                      
Investment income, gross                 159,769 176,354 172,731
Cash and Cash Equivalents [Member]
                     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]                      
Investment income, gross                 775 2,243 554
Other [Member]
                     
Schedule of Investment Income, Reported Amounts, by Category [Line Items]                      
Investment income, gross                 $ 5,711 $ 6,348 $ 4,020