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Schedule II - Condensed Financial Information of Registrant (Statements of Cash Flows (Parent Company)) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from operating activities: |  |  |
Net income | $ 1,381,359 | $ 1,381,062 | $ 1,022,490
Adjustments to reconcile net income to net cash from operating activities: |  |  |
Depreciation and (accretion) amortization | (20,861) | 55,872 | 129,682
Equity in undistributed earnings of subsidiaries | (16,743) | (145,099) | (220,014)
Stock incentive plans | 51,000 | 49,411 | 46,680
Change in: |  |  |
Other liabilities | 14,462 | 19,878 | 89,467
Net cash from operating activities | 2,929,238 | 2,568,604 | 2,183,987
Cash from (used in) investing activities: |  |  |
Proceeds from sale of fixed maturity securities | 1,011,195 | 797,948 | 1,842,139
Proceeds from maturities and prepayments of fixed maturity securities | 3,506,903 | 4,891,179 | 6,067,230
Cost of purchases of fixed maturity securities | (6,664,763) | (8,036,680) | (10,716,748)
Change in loans receivable | (29,719) | (83,212) | (27,421)
Change in balances due from security brokers | (33,929) | 14,337 | (17,983)
Net cash used in investing activities | (1,961,964) | (1,891,355) | (2,989,146)
Cash (used in) from financing activities: |  |  |
Purchase of common treasury shares | (537,163) | (94,140) | (122,426)
Cash dividends to common stockholders | (501,456) | (235,192) | (355,736)
Other, net | (22,902) | (12,848) | (45,162)
Net cash (used in) from financing activities | (1,062,495) | (771,992) | 5,831
Net decrease in cash and cash equivalents | (86,151) | (119,497) | (803,523)
Cash and cash equivalents at beginning of year | 1,449,346 | 1,568,843 | 2,372,366
Cash and cash equivalents at end of year | 1,363,195 | 1,449,346 | 1,568,843
Parent Company |  |  |
Cash flows from operating activities: |  |  |
Net income | 1,381,359 | 1,381,062 | 1,022,490
Adjustments to reconcile net income to net cash from operating activities: |  |  |
Net investment losses (gains) | 5,895 | (1,007) | (1,474)
Depreciation and (accretion) amortization | (6,753) | 4,281 | 18,761
Equity in undistributed earnings of subsidiaries | (491,501) | (1,511,478) | (763,367)
Tax payments received from subsidiaries | 373,504 | 321,682 | 328,851
Federal income taxes provided by subsidiaries on a separate return basis | (253,291) | (414,660) | (294,731)
Stock incentive plans | 51,000 | 49,411 | 48,440
Change in: |  |  |
Federal income taxes | (15,793) | (40,746) | (22,017)
Other assets | (5,648) | 3,163 | (33,319)
Other liabilities | (88,954) | 87,100 | (11,758)
Accrued investment income | 1,200 | 890 | 755
Net cash from operating activities | 951,018 | (120,302) | 292,631
Cash from (used in) investing activities: |  |  |
Proceeds from sale of fixed maturity securities | 748,825 | 543,549 | 402,046
Proceeds from maturities and prepayments of fixed maturity securities | 82,075 | 83,134 | 654,134
Cost of purchases of fixed maturity securities | (732,685) | (109,289) | (1,071,823)
Change in loans receivable | 17,843 | (16,249) | (18,227)
Investments in and advances to subsidiaries, net | 21,605 | (171,062) | (1,411)
Change in balances due from security brokers | (38) | (10,289) | 10,487
Net additions to real estate, furniture & equipment | (18) | (432) | (1,496)
Other, net | 290 | 368 | 95
Net cash used in investing activities | 137,897 | 319,730 | (26,195)
Cash (used in) from financing activities: |  |  |
Net proceeds from issuance of senior notes | 0 | (914) | 1,029,579
Repayment and redemption of debt | 0 | (426,503) | (400,000)
Purchase of common treasury shares | (537,163) | (94,140) | (122,426)
Cash dividends to common stockholders | (501,456) | (235,192) | (355,736)
Other, net | (25,384) | (23,194) | (30,776)
Net cash (used in) from financing activities | (1,064,003) | (779,943) | 120,641
Net decrease in cash and cash equivalents | 24,912 | (580,515) | 387,077
Cash and cash equivalents at beginning of year | 103,522 | 684,037 | 296,960
Cash and cash equivalents at end of year | $ 128,434 | $ 103,522 | $ 684,037

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