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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues:                      
Net investment income $ 554,355 $ 549,391 $ 533,282 $ 510,784 $ 512,709 $ 500,202 $ 493,489 $ 485,597 $ 2,147,812 $ 1,991,997 $ 1,849,872
Change in fair value of derivatives (1,054,281) 595,311 132,205 (451,083) 661,993 362,525 266,820 386,533 (777,848) 1,677,871 164,219
Loss on extinguishment of debt         0 (18,389) (428) 0 0 (18,817) 0
Total revenues (450,985) 1,193,738 685,473 118,872 1,239,270 905,953 819,128 927,301 1,547,098 3,891,652 2,220,282
Expenses:                      
Interest expense on notes and loan payable                 25,498 30,368 28,248
Interest expense on subordinated debentures issued to subsidiary trusts                 15,491 14,124 12,958
Other operating costs and expenses                 129,301 111,691 102,231
Total benefits and expenses                 981,356 3,575,381 2,090,035
Income tax expense                 107,726 141,626 47,004
Net income $ 53,823 $ 169,328 $ 93,903 $ 140,962 $ 36,803 $ 56,957 $ 26,946 $ 53,939 458,016 174,645 83,243
Parent Company                      
Revenues:                      
Net investment income                 773 492 78
Dividends from subsidiary trusts                 461 410 384
Dividends from dissolved subsidiaries                 10,393 0 0
Surplus note interest from subsidiary                 4,080 4,080 4,080
Change in fair value of derivatives                 1,051 (412) (810)
Loss on extinguishment of debt                 0 (18,817) 0
Total revenues                 109,093 69,694 79,438
Expenses:                      
Interest expense on notes and loan payable                 25,498 30,368 28,248
Interest expense on subordinated debentures issued to subsidiary trusts                 15,491 14,124 12,958
Other operating costs and expenses                 18,579 9,234 8,551
Total benefits and expenses                 59,568 53,726 49,757
Income before income taxes and equity in undistributed income of subsidiaries                 49,525 15,968 29,681
Income tax expense                 2,603 6,895 12,073
Income before equity in undistributed income of subsidiaries                 46,922 9,073 17,608
Equity in undistributed income of subsidiaries                 411,094 165,572 65,635
Net income                 458,016 174,645 83,243
Investment Advisory Fees | Parent Company                      
Revenues:                      
Investment advisory fees                 $ 92,335 $ 83,941 $ 75,706