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Fixed Maturity Securities In An Unrealized Loss Position
 9 Months Ended
Sep. 30, 2021
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, 2021 and December 31, 2020 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, 2021
U.S. government and government agency$61,386 $394 $17,342 $113 $78,728 $507 
State and municipal353,630 4,345 28,562 1,990 382,192 6,335 
Mortgage-backed318,897 4,502 84,883 2,793 403,780 7,295 
Asset-backed3,373,100 12,389 105,823 1,812 3,478,923 14,201 
Corporate1,465,027 11,044 54,678 2,618 1,519,705 13,662 
Foreign government371,164 7,249 47,331 27,362 418,495 34,611 
Fixed maturity securities$5,943,204 $39,923 $338,619 $36,688 $6,281,823 $76,611 
December 31, 2020
U.S. government and government agency$47,649 $347 $17 $— $47,666 $347 
State and municipal147,754 1,165 20,528 904 168,282 2,069 
Mortgage-backed212,388 5,121 23,943 230 236,331 5,351 
Asset-backed1,389,133 6,563 656,877 26,934 2,046,010 33,497 
Corporate612,177 6,721 39,985 1,759 652,162 8,480 
Foreign government143,729 22,871 6,218 21,577 149,947 44,448 
Fixed maturity securities$2,552,830 $42,788 $747,568 $51,404 $3,300,398 $94,192 
    Substantially all of the securities in an unrealized loss position are rated investment grade, except for the securities in the foreign government classification. A significant amount of the unrealized loss on foreign government securities is the result of changes in currency exchange rates. 
    A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at September 30, 2021 is presented in the table below:
($ in thousands)Number of
Securities		Aggregate
Fair Value		Gross
Unrealized Loss
Foreign government31 $119,141 $32,048 
Corporate13 49,623 1,879 
State and municipal2 39,693 335 
Mortgage-backed4 249 16 
Asset-backed1 94 3 
Total51 $208,800 $34,281 
    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.
     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.