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Fixed Maturity Securities In An Unrealized Loss Position
 3 Months Ended
Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract]  
Fixed Maturity Securities In An Unrealized Loss Position Fixed Maturity Securities in an Unrealized Loss Position
    The following tables summarize all fixed maturity securities in an unrealized loss position at March 31, 2025 and December 31, 2024 by the length of time those securities have been continuously in an unrealized loss position:
  Less Than 12 Months12 Months or GreaterTotal
(In thousands)Fair
Value		Gross
Unrealized Losses		Fair
Value		Gross
Unrealized Losses		Fair
Value		Gross
Unrealized Losses
March 31, 2025
U.S. government and government agency$730,275 $5,910 $576,231 $22,185 $1,306,506 $28,095 
State and municipal238,597 3,961 1,371,842 61,160 1,610,439 65,121 
Mortgage-backed925,345 10,699 987,497 149,560 1,912,842 160,259 
Asset-backed1,110,183 4,871 590,123 29,118 1,700,306 33,989 
Corporate836,171 8,431 2,646,520 107,914 3,482,691 116,345 
Foreign government375,595 14,306 429,851 179,927 805,446 194,233 
Fixed maturity securities$4,216,166 $48,178 $6,602,064 $549,864 $10,818,230 $598,042 
December 31, 2024
U.S. government and government agency$767,515 $9,637 $560,260 $33,226 $1,327,775 $42,863 
State and municipal348,116 8,027 1,411,761 81,430 1,759,877 89,457 
Mortgage-backed1,541,464 21,326 1,060,823 171,734 2,602,287 193,060 
Asset-backed411,763 4,613 626,237 36,899 1,038,000 41,512 
Corporate1,791,970 21,346 2,951,377 135,117 4,743,347 156,463 
Foreign government600,103 17,933 476,479 167,440 1,076,582 185,373 
Fixed maturity securities$5,460,931 $82,882 $7,086,937 $625,846 $12,547,868 $708,728 
    Substantially all of the securities in an unrealized loss position are rated investment grade, except for the securities in the foreign government classification. A significant amount of the unrealized loss on foreign government securities is the result of changes in currency exchange rates. 
    A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at March 31, 2025 is presented in the table below:
($ in thousands)Number of
Securities		Aggregate
Fair Value		Gross
Unrealized Loss
Foreign government75 $182,410 $173,141 
Corporate28 63,624 2,771 
State and municipal6 28,784 1,280 
Mortgage-backed17 4,303 176 
Asset-backed1 8 2 
Total127 $279,129 $177,370 
    For fixed maturity securities that management does not intend to sell or to be required to sell, the portion of the decline in value that is considered to be due to credit factors is recognized in earnings, and the portion of the decline in value that is considered to be due to non-credit factors is recognized in other comprehensive income (loss).
     The Company has evaluated its fixed maturity securities in an unrealized loss position and believes the unrealized losses are due primarily to temporary market and sector-related factors rather than to issuer-specific factors. None of these securities are delinquent or in default under financial covenants. Based on its assessment of these issuers, the Company expects them to continue to meet their contractual payment obligations as they become due.