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Investment Information - Allowance for expected credit losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Additions for current-period provision for expected credit losses $ 3,597 $ 0 $ 0
Fixed maturities      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Balance at beginning of period 0    
Cumulative effect of accounting change [1],[2] 634    
Additions for current-period provision for expected credit losses 10,653    
Additions (reductions) for previously recognized expected credit losses (7,030)    
Reductions due to disposals (1,860)    
Write-offs charged against the allowance 0    
Balance at end of period 2,397 0  
Fixed maturities | Stuctured securities      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Balance at end of period [3] 1,090    
Fixed maturities | Municipal bonds      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Balance at beginning of period 0    
Cumulative effect of accounting change [1],[2] 0    
Additions for current-period provision for expected credit losses 67    
Additions (reductions) for previously recognized expected credit losses 6    
Reductions due to disposals (62)    
Write-offs charged against the allowance 0    
Balance at end of period 11 [3] 0  
Fixed maturities | Corporate bonds      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Balance at beginning of period 0    
Cumulative effect of accounting change [1],[2] 117    
Additions for current-period provision for expected credit losses 7,644    
Additions (reductions) for previously recognized expected credit losses (5,638)    
Reductions due to disposals (1,227)    
Write-offs charged against the allowance 0    
Balance at end of period 896 0  
Fixed maturities | Structured securities      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Balance at beginning of period [4] 0    
Cumulative effect of accounting change [1],[2],[4] 517    
Additions for current-period provision for expected credit losses [4] 2,942    
Additions (reductions) for previously recognized expected credit losses [4] (1,398)    
Reductions due to disposals [4] (571)    
Write-offs charged against the allowance [4] 0    
Balance at end of period [4] $ 1,490 $ 0  
[1] Adoption of ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326)”
[2] Adoption of ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326)”
[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.
[4] Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities.