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Investment Information - Allowance for expected credit losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Allowance for expected credit losses        
Balance at beginning of period $ 5,869   $ 0  
Cumulative effect of accounting change 0   634  
Additions for current-period provision for expected credit losses 229   10,578  
Additions (reductions) for previously recognized expected credit losses (1,560)   (5,815)  
Reductions due to disposals (605)   (1,464)  
Write-offs charged against the allowance 0   0  
Balance at end of period 3,933   3,933  
Fixed maturities        
Allowance for expected credit losses        
Additions for current-period provision for expected credit losses (1,332) $ 0 4,763 $ 0
Balance at end of period 3,933   3,933  
Fixed maturities | Structured securities        
Allowance for expected credit losses        
Balance at beginning of period 1,726   0  
Cumulative effect of accounting change 0   517  
Additions for current-period provision for expected credit losses 27   2,868  
Additions (reductions) for previously recognized expected credit losses 403   (903)  
Reductions due to disposals (28)   (354)  
Write-offs charged against the allowance 0   0  
Balance at end of period 2,128   2,128  
Fixed maturities | Municipal bonds        
Allowance for expected credit losses        
Balance at beginning of period 28   0  
Cumulative effect of accounting change 0   0  
Additions for current-period provision for expected credit losses 0   67  
Additions (reductions) for previously recognized expected credit losses 33   8  
Reductions due to disposals 0   (14)  
Write-offs charged against the allowance 0   0  
Balance at end of period 61   61  
Fixed maturities | Corporate bonds        
Allowance for expected credit losses        
Balance at beginning of period 4,115   0  
Cumulative effect of accounting change 0   117  
Additions for current-period provision for expected credit losses 202   7,643  
Additions (reductions) for previously recognized expected credit losses (1,996)   (4,920)  
Reductions due to disposals (577)   (1,096)  
Write-offs charged against the allowance 0   0  
Balance at end of period 1,744   1,744  
Short-term investments        
Allowance for expected credit losses        
Balance at beginning of period 0   0  
Cumulative effect of accounting change 0   0  
Additions for current-period provision for expected credit losses 0   0  
Additions (reductions) for previously recognized expected credit losses 0   0  
Reductions due to disposals 0   0  
Write-offs charged against the allowance 0   0  
Balance at end of period [1] $ 0   $ 0  
[1] 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.