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Schedule II - Condensed Financial Information of Registrant (Condensed Statements of Operations) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues:                      
Net investment income $ 521,725 $ 543,331 $ 543,704 $ 573,318 $ 588,217 $ 590,412 $ 570,568 $ 558,438 $ 2,182,078 $ 2,307,635 $ 2,147,812
Change in fair value of derivatives 443,867 205,011 327,662 (941,874) 466,434 (20,042) 76,045 384,469 34,666 906,906 (777,848)
Loss on extinguishment of debt 0 0 0 (2,024) (2,001) 0 0 0 (2,024) (2,001) 0
Total revenues 1,029,699 798,705 919,948 (323,703) 1,113,835 643,396 706,394 1,000,720 2,424,649 3,464,345 1,547,098
Expenses:                      
Interest expense on notes payable                 25,552 25,525 25,498
Interest expense on subordinated debentures issued to subsidiary trusts                 5,557 15,764 15,491
Other operating costs and expenses                 183,636 154,153 129,301
Total benefits and expenses                 1,608,688 3,148,780 981,356
Income tax expense                 144,501 69,475 107,726
Net income                 671,460 246,090 458,016
Less: Preferred stock dividends                 33,515 0 0
Net income available to common stockholders $ (6,262) $ 661,250 $ (253,379) $ 236,336 $ 220,150 $ 37,360 $ 18,590 $ (30,010) 637,945 246,090 458,016
Parent Company                      
Revenues:                      
Net investment income                 1,115 1,755 773
Dividends from subsidiary trusts                 167 469 461
Dividends from dissolved subsidiaries                 0 0 10,393
Surplus note interest from subsidiary                 4,080 4,080 4,080
Change in fair value of derivatives                 62 (1,650) 1,051
Loss on extinguishment of debt                 (2,024) (2,001) 0
Other                 346 0 0
Total revenues                 117,974 110,598 109,093
Expenses:                      
Interest expense on notes payable                 25,552 25,525 25,498
Interest expense on subordinated debentures issued to subsidiary trusts                 5,557 15,764 15,491
Other operating costs and expenses                 46,686 28,357 18,579
Total benefits and expenses                 77,795 69,646 59,568
Income before income taxes and equity in undistributed income of subsidiaries                 40,179 40,952 49,525
Income tax expense                 13,142 11,586 2,603
Income before equity in undistributed income of subsidiaries                 27,037 29,366 46,922
Equity in undistributed income of subsidiaries                 644,423 216,724 411,094
Net income                 671,460 246,090 458,016
Less: Preferred stock dividends                 33,515 0 0
Net income available to common stockholders                 637,945 246,090 458,016
Investment Advisory Fees | Parent Company                      
Revenues:                      
Investment advisory fees                 $ 114,228 $ 107,945 $ 92,335