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Fixed Maturity Securities In An Unrealized Loss Position
 9 Months Ended
Sep. 30, 2024
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 September 30, 2024 and December 31, 2023 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
September 30, 2024
U.S. government and government agency$142,850 $3,128 $586,823 $32,946 $729,673 $36,074 
State and municipal119,658 2,875 1,636,735 67,333 1,756,393 70,208 
Mortgage-backed237,206 925 1,162,601 132,922 1,399,807 133,847 
Asset-backed471,907 1,236 787,420 35,541 1,259,327 36,777 
Corporate308,606 4,573 3,325,568 126,794 3,634,174 131,367 
Foreign government141,247 17,405 617,409 162,231 758,656 179,636 
Fixed maturity securities$1,421,474 $30,142 $8,116,556 $557,767 $9,538,030 $587,909 
December 31, 2023
U.S. government and government agency$384,392 $6,655 $614,623 $51,014 $999,015 $57,669 
State and municipal264,273 3,013 1,680,034 119,449 1,944,307 122,462 
Mortgage-backed278,819 2,025 1,360,748 175,131 1,639,567 177,156 
Asset-backed413,511 2,070 2,176,035 71,136 2,589,546 73,206 
Corporate874,754 11,975 4,418,309 231,288 5,293,063 243,263 
Foreign government204,908 1,758 794,174 135,661 999,082 137,419 
Fixed maturity securities$2,420,657 $27,496 $11,043,923 $783,679 $13,464,580 $811,175 
    Substantially all of the securities in an unrealized loss position are rated investment grade, except for the securities in the foreign government classification. A significant amount of the unrealized loss on foreign government securities is the result of changes in currency exchange rates. 
    A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at September 30, 2024 is presented in the table below:
($ in thousands)Number of
Securities		Aggregate
Fair Value		Gross
Unrealized Loss
Foreign government62 $146,049 $163,081 
State and municipal5 28,143 1,894 
Corporate9 20,185 568 
Mortgage-backed15 2,930 143 
Total91 $197,307 $165,686 
    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.