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Investment Information - Allowance for expected credit losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Allowance for expected credit losses        
Balance at beginning of period $ 34,145 $ 3,830 $ 2,883 $ 2,397
Additions for current-period provision for expected credit losses 18,506 59 49,741 2,662
Additions (reductions) for previously recognized expected credit losses 6,440 (791) 6,921 (1,722)
Reductions due to disposals (681) (974) (1,135) (1,213)
Balance at end of period 58,410 2,124 58,410 2,124
Structured securities        
Allowance for expected credit losses        
Balance at beginning of period [1] 6,998 1,207 802 1,490
Additions for current-period provision for expected credit losses [1] 4,788 52 10,778 234
Additions (reductions) for previously recognized expected credit losses [1] 6,705 (383) 7,192 (765)
Reductions due to disposals [1] (208) (117) (489) (200)
Balance at end of period [1] 18,283 759 18,283 759
Municipal bonds        
Allowance for expected credit losses        
Balance at beginning of period 106 2 2 11
Additions for current-period provision for expected credit losses 252 0 347 0
Additions (reductions) for previously recognized expected credit losses (60) 4 (51) (5)
Reductions due to disposals 0 0 0 0
Balance at end of period 298 6 298 6
Corporate bonds        
Allowance for expected credit losses        
Balance at beginning of period 27,041 2,621 2,079 896
Additions for current-period provision for expected credit losses 13,466 7 38,616 2,428
Additions (reductions) for previously recognized expected credit losses (205) (412) (220) (952)
Reductions due to disposals (473) (857) (646) (1,013)
Balance at end of period $ 39,829 $ 1,359 $ 39,829 $ 1,359
[1] Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities.