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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2024
Fair Value Disclosures [Abstract]  
Carrying Amounts and Estimated Fair Values of Financial Insruments
The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments as of December 31, 2024 and 2023:
 20242023
(In thousands)Carrying ValueFair ValueCarrying ValueFair Value
Assets:    
Fixed maturity securities$22,397,865 $22,399,426 $20,178,308 $20,181,547 
Equity securities1,203,788 1,203,788 1,090,347 1,090,347 
Arbitrage trading account1,122,599 1,122,599 938,049 938,049 
Loans receivable405,453 405,248 201,271 198,244 
Cash and cash equivalents1,974,747 1,974,747 1,363,195 1,363,195 
Trading accounts receivable from brokers and clearing organizations60,327 60,327 303,614 303,614 
Due from broker— — 36,747 36,747 
Liabilities:
Due to broker70,483 70,483 — — 
Trading account securities sold but not yet purchased73,358 73,358 9,357 9,357 
Senior notes and other debt1,831,158 1,425,852 1,827,951 1,480,076 
Subordinated debentures1,009,808 805,864 1,009,090 929,598