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Fixed Maturity Securities In An Unrealized Loss Position
 9 Months Ended
Sep. 30, 2022
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, 2022 and December 31, 2021 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, 2022
U.S. government and government agency$578,877 $63,917 $75,024 $4,890 $653,901 $68,807 
State and municipal2,158,379 139,486 268,007 45,134 2,426,386 184,620 
Mortgage-backed1,260,172 117,781 278,990 62,897 1,539,162 180,678 
Asset-backed2,416,683 97,758 1,595,161 63,716 4,011,844 161,474 
Corporate4,933,243 314,122 1,126,858 159,576 6,060,101 473,698 
Foreign government996,723 80,329 359,283 68,358 1,356,006 148,687 
Fixed maturity securities$12,344,077 $813,393 $3,703,323 $404,571 $16,047,400 $1,217,964 
December 31, 2021
U.S. government and government agency$487,712 $4,026 $17,021 $268 $504,733 $4,294 
State and municipal502,333 7,403 29,547 2,156 531,880 9,559 
Mortgage-backed558,751 6,900 106,130 4,762 664,881 11,662 
Asset-backed3,832,944 18,503 75,385 291 3,908,329 18,794 
Corporate2,582,860 29,322 51,095 3,088 2,633,955 32,410 
Foreign government758,975 15,793 82,057 31,701 841,032 47,494 
Fixed maturity securities$8,723,575 $81,947 $361,235 $42,266 $9,084,810 $124,213 
    Substantially all of the securities in an unrealized loss position are rated investment grade, except for the securities in the foreign government classification. A significant amount of the unrealized loss on foreign government securities is the result of changes in currency exchange rates. 
    A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at September 30, 2022 is presented in the table below:
($ in thousands)Number of
Securities		Aggregate
Fair Value		Gross
Unrealized Loss
Foreign government38 $116,869 $58,770 
Corporate12 46,657 6,277 
State and municipal1 11,582 3,421 
Mortgage-backed11 3,398 229 
Asset-backed2 38 20 
Total64 $178,544 $68,717 
    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.