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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020December 31, 2019
(In thousands)Carrying ValueFair ValueCarrying ValueFair Value
Assets:
Fixed maturity securities$13,893,046 $13,907,561 $14,180,961 $14,194,955 
Equity securities435,303 435,303 480,620 480,620 
Arbitrage trading account595,727 595,727 400,809 400,809 
Loans receivable84,771 86,530 91,799 94,613 
Cash and cash equivalents2,571,447 2,571,447 1,023,710 1,023,710 
Trading account receivables from brokers and clearing organizations252,223 252,223 423,543 423,543 
Liabilities:
Due to broker58,893 58,893 27,116 27,116 
Trading account securities sold but not yet purchased19,254 19,254 36,143 36,143 
Subordinated debentures1,443,736 1,530,810 1,198,704 1,274,088 
Senior notes and other debt1,629,077 1,898,483 1,427,575 1,582,290