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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Condensed Income Statements, Captions [Line Items] |  |  |
Net investment (losses) gains | $ 47,042 | $ 202,397 | $ 90,632
Other income | 381 | 3,396 | 4,177
Total revenues | 12,142,938 | 11,166,499 | 9,455,466
Operating costs and expense | 10,388,535 | 9,446,818 | 8,172,561
Income before income taxes | 1,754,403 | 1,719,681 | 1,282,905
Federal income taxes: |  |  |
Net federal income tax (expense) benefit | (370,557) | (334,727) | (251,890)
Income (Loss) From Investment Funds For the Year Ended | 16,743 | 145,099 | 220,014
Net income to common stockholders | 1,381,359 | 1,381,062 | 1,022,490
Dividends from subsidiaries | 1,261,166 | 22,807 | 520,251
Parent Company |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Management fees and investment income including dividends from subsidiaries of $1,261,166, $22,807, and $520,251 for the years ended December 31, 2023, 2022 and 2021, respectively | 1,325,997 | 32,585 | 548,512
Net investment (losses) gains | (5,895) | 1,007 | 1,474
Other income | 368 | 1,916 | 1,138
Total revenues | 1,320,470 | 35,508 | 551,124
Operating costs and expense | 272,750 | 192,175 | 214,995
Interest expense | 126,397 | 129,633 | 144,837
Income before income taxes | 921,323 | (286,300) | 191,292
Federal income taxes: |  |  |
Federal income taxes provided by subsidiaries on a separate return basis | 253,292 | 414,660 | 294,731
Federal income tax expense on a consolidated return basis | (284,757) | (258,776) | (226,900)
Net federal income tax (expense) benefit | (31,465) | 155,884 | 67,831
Income (loss) before undistributed equity in net income of subsidiaries | 889,858 | (130,416) | 259,123
Income (Loss) From Investment Funds For the Year Ended | 491,501 | 1,511,478 | 763,367
Net income to common stockholders | $ 1,381,359 | $ 1,381,062 | $ 1,022,490

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