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Investment Information - Allowance for expected credit losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Balance at beginning of period $ 2,397    
Additions for current-period provision for expected credit losses 2,100 $ 3,597 $ 0
Balance at end of period 2,883 2,397  
Fixed maturities      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Balance at beginning of period 2,397 0  
Cumulative effect of accounting change [1]   634  
Additions for current-period provision for expected credit losses 3,460 10,653  
Additions (reductions) for previously recognized expected credit losses (1,176) (7,030)  
Reductions due to disposals (1,798) [2] (1,860)  
Balance at end of period 2,883 2,397 0
Fixed maturities | Structured securities      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Balance at beginning of period [3] 1,490 0  
Cumulative effect of accounting change [1],[3]   517  
Additions for current-period provision for expected credit losses [3] 602 2,942  
Additions (reductions) for previously recognized expected credit losses [3] (847) (1,398)  
Reductions due to disposals [3] (443) [2] (571)  
Balance at end of period [3] 802 1,490 0
Fixed maturities | Municipal bonds      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Balance at beginning of period 11 [4],[5] 0  
Cumulative effect of accounting change [1]   0  
Additions for current-period provision for expected credit losses 0 67  
Additions (reductions) for previously recognized expected credit losses (9) 6  
Reductions due to disposals 0 [2] (62)  
Balance at end of period 2 11 [4],[5] 0
Fixed maturities | Corporate bonds      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Balance at beginning of period 896 0  
Cumulative effect of accounting change [1]   117  
Additions for current-period provision for expected credit losses 2,858 7,644  
Additions (reductions) for previously recognized expected credit losses (320) (5,638)  
Reductions due to disposals (1,355) [2] (1,227)  
Balance at end of period $ 2,079 $ 896 $ 0
[1] Adoption of ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326)”
[2] Reduction for the 2021 periods primarily related to the Company’s deconsolidation of Somers.
[3] Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities.
[4] 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.
[5] In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities pledged. For purposes of this table, the Company has excluded the collateral received under securities lending, at fair value and included the securities pledged under securities lending, at fair value. See “—Securities Lending Agreements.” In 2021, the Company terminated its securities lending program and no longer enters into securities lending agreements with financial institutions.