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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

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