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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
Carrying Amounts And Estimated Fair Values Of Financial Instruments The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments:
  September 30, 2025December 31, 2024
(In thousands)Carrying ValueFair ValueCarrying ValueFair Value
Assets:
Fixed maturity securities$24,947,949 $24,949,094 $22,397,865 $22,399,426 
Equity securities1,382,432 1,382,432 1,203,788 1,203,788 
Arbitrage trading account1,070,304 1,070,304 1,122,599 1,122,599 
Loans receivable326,855 327,102 405,453 405,248 
Cash and cash equivalents2,404,019 2,404,019 1,974,747 1,974,747 
Trading account receivables from brokers and clearing organizations113,330 113,330 60,327 60,327 
Liabilities:
Due to broker130,723 130,723 70,483 70,483 
Trading account securities sold but not yet purchased34,509 34,509 73,358 73,358 
Senior notes and other debt1,829,511 1,482,612 1,831,158 1,425,852 
Subordinated debentures1,010,347 834,836 1,009,808 805,864