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Investment Information - Allowance for expected credit losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Allowance for expected credit losses        
Balance at beginning of period $ 3,830 $ 9,938 $ 2,397 $ 0
Cumulative effect of accounting change [1]       634
Additions for current-period provision for expected credit losses 59 1,000 2,662 10,349
Additions (reductions) for previously recognized expected credit losses (791) (4,232) (1,722) (4,255)
Reductions due to disposals (974) (837) (1,213) (859)
Balance at end of period 2,124 5,869 $ 2,124 5,869
Accounting Standards Update     us-gaap:AccountingStandardsUpdate201613Member  
Fixed maturities        
Allowance for expected credit losses        
Balance at beginning of period     $ 2,397  
Additions for current-period provision for expected credit losses (896) (3,225) 752 6,095
Balance at end of period 2,124   2,124  
Fixed maturities | Structured securities        
Allowance for expected credit losses        
Balance at beginning of period [2] 1,207 2,654 1,490 0
Cumulative effect of accounting change [1],[2]       517
Additions for current-period provision for expected credit losses [2] 52 695 234 2,841
Additions (reductions) for previously recognized expected credit losses [2] (383) (1,304) (765) (1,306)
Reductions due to disposals [2] (117) (319) (200) (326)
Balance at end of period 759 1,726 759 1,726
Fixed maturities | Municipal bonds        
Allowance for expected credit losses        
Balance at beginning of period 2 23 11 0
Cumulative effect of accounting change [1]       0
Additions for current-period provision for expected credit losses 0 44 0 67
Additions (reductions) for previously recognized expected credit losses 4 (25) (5) (25)
Reductions due to disposals 0 (14) 0 (14)
Balance at end of period 6 28 6 28
Fixed maturities | Corporate bonds        
Allowance for expected credit losses        
Balance at beginning of period 2,621 7,232 896 0
Cumulative effect of accounting change [1]       117
Additions for current-period provision for expected credit losses 7 290 2,428 7,441
Additions (reductions) for previously recognized expected credit losses (412) (2,903) (952) (2,924)
Reductions due to disposals (857) (504) (1,013) (519)
Balance at end of period 1,359 4,115 1,359 4,115
Short-term investments        
Allowance for expected credit losses        
Balance at beginning of period 0 29 0 [3] 0
Cumulative effect of accounting change [1]       0
Additions for current-period provision for expected credit losses 0 (29) 0 0
Additions (reductions) for previously recognized expected credit losses 0 0 0 0
Reductions due to disposals 0 0 0 0
Balance at end of period $ 0 [3] $ 0 $ 0 [3] $ 0
[1] Adoption of ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326)”
[2] Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities.
[3] Effective January 1, 2020, the Company adopted ASU 2016-13 and as a result any credit impairment losses on the Company’s available-for-sale investments are recorded as an allowance, subject to reversal.