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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2022
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, 2022December 31, 2021
(In thousands)Carrying ValueFair ValueCarrying ValueFair Value
Assets:
Fixed maturity securities$17,230,936 $17,234,486 $16,602,673 $16,614,118 
Equity securities1,173,589 1,173,589 941,243 941,243 
Arbitrage trading account1,165,016 1,165,016 1,179,606 1,179,606 
Loans receivable112,800 111,524 115,172 116,534 
Cash and cash equivalents1,130,750 1,130,750 1,568,843 1,568,843 
     Due from broker— — 20,448 20,448 
Liabilities:
Due to broker157,086 157,086 — — 
Trading account payable to brokers and clearing organizations820 820 53,636 53,636 
Trading account securities sold but not yet purchased6 6 1,169 1,169 
Senior notes and other debt1,834,287 1,423,228 2,259,416 2,526,630 
Subordinated debentures1,008,191 807,116 1,007,652 1,095,600