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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues:                      
Net investment income $ 588,217 $ 590,412 $ 570,568 $ 558,438 $ 554,355 $ 549,391 $ 533,282 $ 510,784 $ 2,307,635 $ 2,147,812 $ 1,991,997
Change in fair value of derivatives 466,434 (20,042) 76,045 384,469 (1,054,281) 595,311 132,205 (451,083) 906,906 (777,848) 1,677,871
Loss on extinguishment of debt (2,001) 0 0 0         (2,001) 0 (18,817)
Total revenues 1,113,835 643,396 706,394 1,000,720 (450,985) 1,193,738 685,473 118,872 3,464,345 1,547,098 3,891,652
Expenses:                      
Interest expense on notes and loan payable                 25,525 25,498 30,368
Interest expense on subordinated debentures issued to subsidiary trusts                 15,764 15,491 14,124
Other operating costs and expenses                 154,153 129,301 111,691
Total benefits and expenses                 3,148,780 981,356 3,575,381
Income tax expense                 69,475 107,726 141,626
Net income $ 220,150 $ 37,360 $ 18,590 $ (30,010) $ 53,823 $ 169,328 $ 93,903 $ 140,962 246,090 458,016 174,645
Parent Company                      
Revenues:                      
Net investment income                 1,755 773 492
Dividends from subsidiary trusts                 469 461 410
Dividends from dissolved subsidiaries                 0 10,393 0
Surplus note interest from subsidiary                 4,080 4,080 4,080
Change in fair value of derivatives                 (1,650) 1,051 (412)
Loss on extinguishment of debt                 (2,001) 0 (18,817)
Total revenues                 110,598 109,093 69,694
Expenses:                      
Interest expense on notes and loan payable                 25,525 25,498 30,368
Interest expense on subordinated debentures issued to subsidiary trusts                 15,764 15,491 14,124
Other operating costs and expenses                 28,357 18,579 9,234
Total benefits and expenses                 69,646 59,568 53,726
Income before income taxes and equity in undistributed income of subsidiaries                 40,952 49,525 15,968
Income tax expense                 11,586 2,603 6,895
Income before equity in undistributed income of subsidiaries                 29,366 46,922 9,073
Equity in undistributed income of subsidiaries                 216,724 411,094 165,572
Net income                 246,090 458,016 174,645
Investment Advisory Fees | Parent Company                      
Revenues:                      
Investment advisory fees                 $ 107,945 $ 92,335 $ 83,941