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Schedule II - Condensed Financial Information of Registrant Condensed Statements of Operations (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues [Abstract]                      
Net Investment Income $ 321,160 $ 318,594 $ 320,259 $ 326,910 $ 324,272 $ 305,502 $ 296,878 $ 292,128 $ 1,286,923 $ 1,218,780 $ 1,036,106
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses 1,471 (1,238) (611) (6,076) 698 (17,292) (854) (1,193) (6,454) (18,641) 23,726
Change in fair value of derivatives (48,266) 161,090 (150,847) 259,161 92,269 (333,621) (22,029) 148,653 221,138 (114,728) 168,862
Loss on Extinguishment of Debt                 0 0 (292)
Total revenues 291,915 503,935 192,979 599,729 422,704 (30,771) 294,947 452,895 1,588,558 1,139,775 1,285,592
Benefits, Losses and Expenses [Abstract]                      
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net                 286,899 (105,194) 130,950
Interest expense on notes payable                 28,479 31,633 22,125
Interest expense on subordinated debentures                 13,458 13,977 14,906
Other Cost and Expense, Operating                 95,495 67,529 114,615
Total benefits and expenses                 1,502,569 1,006,861 1,220,326
Income Tax Expense                 28,191 46,666 22,333
Net Income (Loss) Attributable to Parent 36,397 (7,829) 18,759 10,471 49,699 (13,068) 18,274 31,343 57,798 86,248 42,933
Parent Company [Member]
                      
Revenues [Abstract]                      
Net Investment Income                 565 298 295
Dividends Received from Subsidiary Trusts                 403 427 455
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries                 0 0 0
Investment Advisory Fees                 36,178 29,765 23,713
Interest Income, Related Party                 4,080 4,080 4,080
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses                 0 18 13
Change in fair value of derivatives                 (7,472) (21,146) 27,059
Loss on Extinguishment of Debt                 0 0 (292)
Total revenues                 33,754 13,442 55,323
Benefits, Losses and Expenses [Abstract]                      
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net                 (2,488) (21,002) 29,595
Interest expense on notes payable                 28,479 31,633 22,125
Interest expense on subordinated debentures                 13,458 13,977 14,906
Other Cost and Expense, Operating                 8,228 7,307 6,013
Total benefits and expenses                 47,677 31,915 72,639
Income (Loss) Before Income Taxes and Undistributed Income of Subsidiaries                 (13,923) (18,473) (17,316)
Income Tax Expense                 (5,944) (7,407) (7,417)
Income (Loss) Before Equity in Undistributed Income of Subsidiaries                 (7,979) (11,066) (9,899)
Equity in Undistributed Income of Subsidiaries                 65,777 97,314 52,832
Net Income (Loss) Attributable to Parent                 $ 57,798 $ 86,248 $ 42,933