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Investments (Tables)
 12 Months Ended
Dec. 31, 2021
Investments [Abstract]  
Gains And Losses Due To Changes In Fair Value
The following table presents gains (losses) due to changes in fair value of investments that are measured at fair value pursuant to application of the fair value option:
 Year Ended December 31,
 202120202019
 (Amounts in thousands)
Fixed maturity securities$(39,649)$41,394 $104,379 
Equity securities107,701 32,232 90,920 
Short-term investments(141)(1,014)1,295 
       Total gains$67,911 $72,612 $196,594 
Gross Gains And Losses Realized On Sales Of Investments
The following table presents gross gains (losses) realized on the sales of investments:
 Year Ended December 31,
 202120202019
 (Amounts in thousands)
 Gross
Realized
Gains		Gross
Realized
Losses		NetGross
Realized
Gains		Gross
Realized
Losses		NetGross
Realized
Gains		Gross
Realized
Losses		Net
Fixed maturity securities$2,306 $(6,690)$(4,384)$1,884 $(4,296)$(2,412)$2,413 $(1,066)$1,347 
Equity securities64,061 (18,826)45,235 75,591 (80,134)(4,543)47,411 (28,089)19,322 
Short-term investments236 (381)(145)146 (2,438)(2,292)177 (2,133)(1,956)
Estimated Fair Values Of Investments
The following table presents the estimated fair values of the Company's fixed maturity securities at December 31, 2021 by contractual maturity. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
 Estimated Fair Value
 (Amounts in thousands)
Fixed maturity securities:
Due in one year or less$403,269 
Due after one year through five years791,879 
Due after five years through ten years806,813 
Due after ten years2,029,562 
Total$4,031,523 
Investment Income
The following table presents a summary of net investment income:
 Year Ended December 31,
 202120202019
 (Amounts in thousands)
Fixed maturity securities$100,001 $100,166 $102,254 
Equity securities35,064 37,598 32,233 
Short-term investments1,059 2,822 12,381 
Total investment income$136,124 $140,586 $146,868 
Less: investment expense(6,397)(5,728)(5,605)
Net investment income$129,727 $134,858 $141,263