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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2024
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:
  June 30, 2024December 31, 2023
(In thousands)Carrying ValueFair ValueCarrying ValueFair Value
Assets:
Fixed maturity securities$21,082,676 $21,084,502 $20,178,308 $20,181,547 
Equity securities1,078,092 1,078,092 1,090,347 1,090,347 
Arbitrage trading account1,221,861 1,221,861 938,049 938,049 
Loans receivable349,325 349,310 201,271 198,244 
Cash and cash equivalents1,580,270 1,580,270 1,363,195 1,363,195 
Trading account receivables from brokers and clearing organizations40,705 40,705 303,614 303,614 
     Due from broker— — 36,747 36,747 
Liabilities:
Due to broker128,563 128,563 — — 
Trading account securities sold but not yet purchased81,273 81,273 9,357 9,357 
Senior notes and other debt1,828,422 1,422,506 1,827,951 1,480,076 
Subordinated debentures1,009,449 825,344 1,009,090 929,598