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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

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