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Investment Information - Net realized gains and losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Available for sale securities:    
Available for sale securities, gross gains on investment sales $ 19,707 $ 65,002
Available for sale securities, gross losses on investment sales (108,347) (62,998)
Equity securities, at fair value:    
Net realized gains (losses) on sales during the period 65,211 37,849
Net unrealized gains (losses) on equity securities still held at reporting date (176,195) 19,708
Allowance for credit losses:    
Allowance for credit losses - investments related (31,722) (1,648)
Allowance for credit losses - underwriting related (4,286) 5,268
Derivative instruments [1] (23,711) 36,116
Other (3,409) (23,045)
Net realized gains (losses) (292,414) 142,461
Fixed maturities    
Available for sale securities:    
Change in fair value of assets and liabilities accounted for using the fair value option (30,589) 16,553
Other investments    
Available for sale securities:    
Change in fair value of assets and liabilities accounted for using the fair value option 4,389 46,855
Equity securities    
Available for sale securities:    
Change in fair value of assets and liabilities accounted for using the fair value option (3,313) 2,065
Short-term investments    
Available for sale securities:    
Change in fair value of assets and liabilities accounted for using the fair value option $ (149) $ 736
[1] See note 9 for information on the Company’s derivative instruments.