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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Cash flows from operating activities: |  |  |
Net income | $ 1,756,115 | $ 1,381,359 | $ 1,381,062
Adjustments to reconcile net income to net cash from operating activities: |  |  |
Depreciation and (accretion) amortization | (170,638) | (20,861) | 55,872
Equity in undistributed earnings of subsidiaries | 11,491 | (16,743) | (145,099)
Stock incentive plans | 54,381 | 51,000 | 49,411
Change in: |  |  |
Other liabilities | 70,851 | 14,462 | 19,878
Net cash from operating activities | 3,678,368 | 2,929,238 | 2,568,604
Cash (used in) from investing activities: |  |  |
Proceeds from sale of fixed maturity securities | 2,310,746 | 1,011,195 | 797,948
Proceeds from maturities and prepayments of fixed maturity securities | 4,890,572 | 3,506,903 | 4,891,179
Cost of purchases of fixed maturity securities | (9,368,703) | (6,664,763) | (8,036,680)
Change in loans receivable | (210,816) | (29,719) | (83,212)
Change in balances due from security brokers | 107,280 | (33,929) | 14,337
Net cash used in investing activities | (2,184,489) | (1,961,964) | (1,891,355)
Cash used in financing activities: |  |  |
Purchase of common treasury shares | (303,655) | (537,163) | (94,140)
Cash dividends to common stockholders | (531,953) | (501,456) | (235,192)
Other, net | (19,984) | (22,902) | (12,848)
Net cash used in financing activities | (852,487) | (1,062,495) | (771,992)
Net increase (decrease) in cash and cash equivalents | 611,552 | (86,151) | (119,497)
Cash and cash equivalents at beginning of year | 1,363,195 | 1,449,346 | 1,568,843
Cash and cash equivalents at end of year | 1,974,747 | 1,363,195 | 1,449,346
Parent Company |  |  |
Cash flows from operating activities: |  |  |
Net income | 1,756,115 | 1,381,359 | 1,381,062
Adjustments to reconcile net income to net cash from operating activities: |  |  |
Net investment (gains) losses | (90,284) | 5,895 | (1,007)
Depreciation and (accretion) amortization | (5,120) | (6,753) | 4,281
Equity in undistributed earnings of subsidiaries | (749,350) | (491,501) | (1,511,478)
Tax payments received from subsidiaries | 432,402 | 373,504 | 321,682
Federal income taxes provided by subsidiaries on a separate return basis | (424,456) | (253,292) | (414,660)
Stock incentive plans | 54,381 | 51,000 | 49,411
Change in: |  |  |
Federal income taxes | (9,346) | (15,793) | (40,746)
Equity in undistributed earnings of other investments | (10,444) | 0 | 0
Other assets | (9,888) | (5,647) | 3,163
Other liabilities | 114,418 | (88,954) | 87,100
Accrued investment income | (1,740) | 1,200 | 890
Net cash from operating activities | 1,056,688 | 951,018 | (120,302)
Cash (used in) from investing activities: |  |  |
Proceeds from sale of fixed maturity securities | 598,915 | 748,825 | 543,549
Proceeds from maturities and prepayments of fixed maturity securities | 260,999 | 82,075 | 83,134
Cost of purchases of fixed maturity securities | (824,476) | (732,685) | (109,289)
Change in loans receivable | 64,200 | 17,843 | (16,249)
Investments in and advances to subsidiaries, net | (238,337) | 21,605 | (171,062)
Change in balances due from security brokers | (71,143) | (38) | (10,289)
Net additions to real estate, furniture & equipment | (37) | (18) | (432)
Other, net | 73 | 290 | 368
Net cash used in investing activities | (209,806) | 137,897 | 319,730
Cash used in financing activities: |  |  |
Net proceeds from issuance of senior notes | 0 | 0 | (914)
Repayment and redemption of debt | 0 | 0 | (426,503)
Purchase of common treasury shares | (303,655) | (537,163) | (94,140)
Cash dividends to common stockholders | (531,953) | (501,456) | (235,192)
Other, net | (26,777) | (25,384) | (23,194)
Net cash used in financing activities | (862,385) | (1,064,003) | (779,943)
Net increase (decrease) in cash and cash equivalents | (15,503) | 24,912 | (580,515)
Cash and cash equivalents at beginning of year | 128,434 | 103,522 | 684,037
Cash and cash equivalents at end of year | $ 112,931 | $ 128,434 | $ 103,522

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