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Fixed Maturity Securities In An Unrealized Loss Position
 3 Months Ended
Mar. 31, 2023
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, 2023 and December 31, 2022 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, 2023
U.S. government and government agency$213,369 $4,312 $527,765 $50,353 $741,134 $54,665 
State and municipal1,070,807 30,908 1,008,985 96,512 2,079,792 127,420 
Mortgage-backed765,967 17,720 866,618 148,720 1,632,585 166,440 
Asset-backed916,431 13,102 2,490,520 104,751 3,406,951 117,853 
Corporate2,694,062 75,595 3,175,233 264,845 5,869,295 340,440 
Foreign government239,947 26,248 786,359 83,587 1,026,306 109,835 
Fixed maturity securities$5,900,583 $167,885 $8,855,480 $748,768 $14,756,063 $916,653 
December 31, 2022
U.S. government and government agency$285,391 $10,219 $453,520 $58,939 $738,911 $69,158 
State and municipal1,720,443 89,272 598,797 79,320 2,319,240 168,592 
Mortgage-backed1,099,549 75,430 473,318 115,528 1,572,867 190,958 
Asset-backed1,569,647 48,390 2,176,638 103,932 3,746,285 152,322 
Corporate3,690,856 150,115 2,349,281 256,631 6,040,137 406,746 
Foreign government477,672 29,815 711,786 105,243 1,189,458 135,058 
Fixed maturity securities$8,843,558 $403,241 $6,763,340 $719,593 $15,606,898 $1,122,834 
    Substantially all of the securities in an unrealized loss position are rated investment grade, except for the securities in the foreign government classification. A significant amount of the unrealized loss on foreign government securities is the result of changes in currency exchange rates. 
    A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at March 31, 2023 is presented in the table below:
($ in thousands)Number of
Securities		Aggregate
Fair Value		Gross
Unrealized Loss
Foreign government33 $105,347 $64,516 
Corporate16 45,507 3,789 
State and municipal1 12,066 2,936 
Mortgage-backed14 4,202 199 
Asset-backed1 8 8 
Total65 $167,130 $71,448 
    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.