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Fixed Maturity Securities In An Unrealized Loss Position
 6 Months Ended
Jun. 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 June 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
June 30, 2021
U.S. government and government agency$38,752 $458 $524 $3 $39,276 $461 
State and municipal205,730 2,222 22,655 1,356 228,385 3,578 
Mortgage-backed266,963 7,799 29,570 540 296,533 8,339 
Asset-backed2,581,697 6,817 606,663 17,312 3,188,360 24,129 
Corporate972,383 8,212 44,055 2,098 1,016,438 10,310 
Foreign government376,746 11,433 11,921 21,429 388,667 32,862 
Fixed maturity securities$4,442,271 $36,941 $715,388 $42,738 $5,157,659 $79,679 
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 $94,192 
    Substantially all of the securities in an unrealized loss position are rated investment grade, except for the securities in the foreign government classification. A significant amount of the unrealized loss on foreign government securities is the result of changes in currency exchange rates. 
    A summary of the Company’s non-investment grade fixed maturity securities that were in an unrealized loss position at June 30, 2021 is presented in the table below:
($ in thousands)Number of
Securities		Aggregate
Fair Value		Gross
Unrealized Loss
Foreign government27 $108,910 $30,171 
Corporate10 36,482 2,058 
Mortgage-backed4 276 19 
Asset-backed1 113 1 
Total42 $145,781 $32,249 
    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.