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Schedule II - Condensed Financial Information of Registrant (Statements of Income (Parent Company)) (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
Condensed Income Statements, Captions [Line Items]                      
Other income                 $ 1,026 $ 2,564 $ 1,764
Total revenues 1,696,679 1,634,124 1,570,962 1,506,769 1,608,601 1,420,501 1,415,747 1,378,705 6,408,534 5,823,554 5,155,984
Operating costs and expense                 5,709,646 5,121,626 4,642,898
Income before income taxes                 698,888 701,928 513,086
Federal income taxes:                      
Net expense                 (193,587) (191,285) (121,945)
Net income to common stockholders 130,379 136,974 115,957 116,615 165,489 100,947 108,838 135,318 499,925 510,592 391,211
Dividends from subsidiaries                 269,626 25,968 503,227
Parent Company
                     
Condensed Income Statements, Captions [Line Items]                      
Management fees and investment income including dividends from subsidiaries of $269,626, $25,968 and $503,227 for the years ended December 31, 2013, 2012 and 2011, respectively                 277,223 29,961 514,057
Net investment gains                 24,550 71,130 45,962
Other income                 223 271 96
Total revenues                 301,996 101,362 560,115
Operating costs and expense                 122,562 133,326 118,922
Interest expense                 120,066 124,298 111,184
Income before income taxes                 59,368 (156,262) 330,009
Federal income taxes:                      
Federal income taxes provided by subsidiaries on a separate return basis                 225,845 132,379 79,200
Federal income tax expense on a consolidated return basis                 (154,928) (160,226) (89,144)
Net expense                 70,917 (27,847) (9,944)
Income (loss) before undistributed equity in net income of subsidiaries                 130,285 (184,109) 320,065
Equity in undistributed net income of subsidiaries                 369,640 694,701 71,146
Net income to common stockholders                 $ 499,925 $ 510,592 $ 391,211