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Investment Information - Net realized gains and losses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Available for sale securities:        
Available for sale securities, gross gains on investment sales $ 115,541 $ 232,153 $ 180,543 $ 410,353
Available for sale securities, gross losses on investment sales (50,627) (49,824) (113,625) (81,792)
Equity securities, at fair value:        
Net realized gains (losses) on sales during the period 33,570 (18,250) 71,419 (18,789)
Net unrealized gains (losses) on equity securities still held at reporting date 65,847 145,686 85,555 (29,880)
Allowance for credit losses:        
Allowance for credit losses - investment related (59) (1,000) (2,662) (10,349)
Allowance for credit losses - underwriting related 1,381 (5,834) 6,649 (9,104)
Net impairment losses     0 (533)
Derivative instruments [1] (51,109) (836) (14,993) 126,353
Other 10,224 (6,515) (12,821) (8,612)
Net realized gains (losses) 202,907 556,588 345,368 189,628
Fixed maturities        
Available for sale securities:        
Change in fair value of assets and liabilities accounted for using the fair value option 10,912 68,181 27,465 (59,485)
Allowance for credit losses:        
Allowance for credit losses - investment related 896 3,225 (752) (6,095)
Other investments        
Available for sale securities:        
Change in fair value of assets and liabilities accounted for using the fair value option 60,884 178,570 107,739 (129,230)
Equity securities        
Available for sale securities:        
Change in fair value of assets and liabilities accounted for using the fair value option 5,492 6,664 7,557 1,755
Short-term investments        
Available for sale securities:        
Change in fair value of assets and liabilities accounted for using the fair value option $ (104) $ 3,368 $ 632 $ (5,313)
[1] See note 9 for information on the Company’s derivative instruments.