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Investment Information - Net realized gains and losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Available for sale securities:        
Available for sale securities, gross gains on investment sales $ 18,030 $ 86,819 $ 52,923 $ 267,362
Available for sale securities, gross losses on investment sales (73,970) (18,446) (239,493) (132,071)
Equity securities, at fair value:        
Net realized gains (losses) on sales during the period (6,401) 14,736 75,689 86,155
Net unrealized gains (losses) on equity securities still held at reporting date (36,162) (40,155) (318,732) 45,400
Allowance for credit losses:        
Allowance for credit losses - investments related 8,652 (456) (48,096) (1,208)
Allowance for credit losses - underwriting related (4,232) (3,985) (7,676) 2,664
Derivative instruments [1] (48,196) (21,435) (117,591) (36,428)
Other (2,649) (41,495) (6,186) (54,316)
Net realized gains (losses) (183,673) (25,040) (742,666) 320,328
Fixed maturities        
Available for sale securities:        
Change in fair value of assets and liabilities accounted for using the fair value option (19,304) (7,492) (89,148) 19,973
Other investments        
Available for sale securities:        
Change in fair value of assets and liabilities accounted for using the fair value option (17,882) 3,811 (35,203) 111,550
Equity securities        
Available for sale securities:        
Change in fair value of assets and liabilities accounted for using the fair value option (584) 3,042 (6,021) 10,599
Short-term investments        
Available for sale securities:        
Change in fair value of assets and liabilities accounted for using the fair value option $ (975) $ 16 $ (3,132) $ 648
[1] See note 9 for information on the Company’s derivative instruments.