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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 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:
  June 30, 2022December 31, 2021
(In thousands)Carrying ValueFair ValueCarrying ValueFair Value
Assets:
Fixed maturity securities$16,851,514 $16,857,031 $16,602,673 $16,614,118 
Equity securities1,155,326 1,155,326 941,243 941,243 
Arbitrage trading account1,142,003 1,142,003 1,179,606 1,179,606 
Loans receivable113,483 112,072 115,172 116,534 
Cash and cash equivalents1,316,603 1,316,603 1,568,843 1,568,843 
Trading account receivables from brokers and clearing organizations9,937 9,937 — — 
     Due from broker— — 20,448 20,448 
Liabilities:
Due to broker49,178 49,178 — — 
Trading account payable to brokers and clearing organizations— — 53,636 53,636 
Trading account securities sold but not yet purchased68 68 1,169 1,169 
Senior notes and other debt1,832,273 1,558,985 2,259,416 2,526,630 
Subordinated debentures1,008,011 810,028 1,007,652 1,095,600