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Schedule II - Condensed Financial Information of Registrant (Statements of Income (Parent Company)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Condensed Income Statements, Captions [Line Items] |  |  |
Net investment gains | $ 202,397 | $ 90,632 | $ 103,000
Other income | 3,396 | 4,177 | 2,596
Total revenues | 11,166,499 | 9,455,466 | 8,098,925
Operating costs and expense | 9,446,818 | 8,172,561 | 7,394,123
Income before income taxes | 1,719,681 | 1,282,905 | 704,802
Federal income taxes: |  |  |
Net federal income tax expense | (334,727) | (251,890) | (171,817)
Net income to common stockholders | 1,381,062 | 1,022,490 | 530,670
Dividends from subsidiaries | 22,807 | 520,251 | 617,424
Parent Company |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Management fees and investment income including dividends from subsidiaries of $22,807, $520,251, and $617,424 for the years ended December 31, 2022, 2021 and 2020, respectively | 32,585 | 548,512 | 654,485
Net investment gains | 1,007 | 1,474 | 3,580
Other income | 1,916 | 1,138 | 568
Total revenues | 35,508 | 551,124 | 658,633
Operating costs and expense | 192,175 | 214,995 | 166,892
Interest expense | 129,633 | 144,837 | 145,417
Income before income taxes | (286,300) | 191,292 | 346,324
Federal income taxes: |  |  |
Federal income taxes provided by subsidiaries on a separate return basis | 414,660 | 294,731 | 188,490
Federal income tax expense on a consolidated return basis | (258,776) | (226,900) | (139,679)
Net federal income tax expense | 155,884 | 67,831 | 48,811
(Loss) income before undistributed equity in net income of subsidiaries | (130,416) | 259,123 | 395,135
Equity in undistributed net income of subsidiaries | 1,511,478 | 763,367 | 135,535
Net income to common stockholders | $ 1,381,062 | $ 1,022,490 | $ 530,670

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