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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
Assets And Liabilities Measured At Fair value, On A Recurring Basis The following tables present the assets and liabilities measured at fair value on a recurring basis as of September 30, 2025 and December 31, 2024 by level:
(In thousands)TotalLevel 1Level 2Level 3
September 30, 2025
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency$3,478,237 $— $3,478,237 $— 
State and municipal1,974,136 — 1,974,136 — 
Mortgage-backed4,969,446 — 4,969,446 — 
Asset-backed3,831,174 — 3,831,174 — 
Corporate8,740,772 — 8,720,753 20,019 
Foreign government1,923,864 — 1,923,864 — 
Total fixed maturity securities available for sale24,917,629 — 24,897,610 20,019 
Equity securities:
Common stocks721,950 718,999 842 2,109 
Preferred stocks660,482 — 651,808 8,674 
Total equity securities1,382,432 718,999 652,650 10,783 
Arbitrage trading account1,070,304 881,153 189,038 113 
Total$27,370,365 $1,600,152 $25,739,298 $30,915 
Liabilities:
Trading account securities sold but not yet purchased$34,509 $34,509 $— $— 
December 31, 2024
Assets:
Fixed maturity securities available for sale:
U.S. government and government agency$2,235,341 $— $2,235,341 $— 
State and municipal2,294,644 — 2,294,644 — 
Mortgage-backed3,765,490 — 3,765,490 — 
Asset-backed3,885,012 — 3,885,012 — 
Corporate8,417,641 — 8,397,974 19,667 
Foreign government1,755,325 — 1,755,325 — 
Total fixed maturity securities available for sale22,353,453 — 22,333,786 19,667 
Equity securities:
Common stocks760,167 757,115 1,011 2,041 
Preferred stocks443,621 — 439,947 3,674 
Total equity securities1,203,788 757,115 440,958 5,715 
Arbitrage trading account1,122,599 1,062,459 56,630 3,510 
Total$24,679,840 $1,819,574 $22,831,374 $28,892 
Liabilities:
Trading account securities sold but not yet purchased$73,358 $73,358 $— $— 
Summarize Changes In Level 3 Assets The following tables summarize changes in Level 3 assets and liabilities for the nine months ended September 30, 2025 and for the year ended December 31, 2024:
Gains (Losses) Included In:
(In thousands)Beginning
Balance		(Losses) Earnings Other
Comprehensive
Income (Losses)		ImpairmentsPurchasesSalesPaydowns / MaturitiesTransfers In / (Out)Ending
Balance
Nine Months Ended September 30, 2025
Assets:
Fixed maturities securities available for sale:
Corporate$19,667 $— $352 $— $— $— $— $— $20,019 
Total19,667 — 352 — — — — — 20,019 
Equity securities:
Common stocks2,041 194 — — — (126)— — 2,109 
Preferred stocks3,674 — — — 6,160 (1,160)— — 8,674 
Total5,715 194 — — 6,160 (1,286)— — 10,783 
Arbitrage trading account3,510 (3,398)— — — — — 1 113 
Total$28,892 $(3,204)$352 $— $6,160 $(1,286)$— $1 $30,915 
Year Ended
December 31, 2024
Assets:
Fixed maturities securities available for sale:
Corporate$— $— $(333)$— $— $— $— $20,000 $19,667 
Total— — (333)— — — — 20,000 19,667 
Equity securities:
Common stocks1,558 611 — — — (128)— — 2,041 
Preferred stocks3,695 36 — — — (57)— — 3,674 
Total5,253 647 — — — (185)— — 5,715 
Arbitrage trading account3,772 (261)— — — (38)— 37 3,510 
Total$9,025 $386 $(333)$— $— $(223)$— $20,037 $28,892