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Investments - Narrative (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
issuer
Mar. 31, 2019
USD ($)
security
loan
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
issuer
loan
Gain (Loss) on Securities [Line Items]        
Number of issuers | issuer 147      
Total fair value $ 368,208      
Gross unrealized losses 14,651      
Fixed maturity securities, available-for-sale 1,570,605     $ 1,433,626
Bank loan participations       $ 260,864
Bank loan participations 202,888      
Unpaid principal balance 260,200      
Net investment income 20,836 $ 19,431    
Net realized and unrealized losses on investments 58,407 $ (1,625)    
Losses due to credit-related impairments 5,000      
Number of impaired loans | loan   2   7
Carrying value of impaired loans   $ 4,400   $ 6,900
Unpaid principal on impaired loans   5,900   14,300
Allowance for credit losses on impaired loans   1,500   7,200
Average recorded investment in impaired bank loans   2,200    
Net realized gain (loss) on changes in fair value of impaired bank loans   $ 1,500    
Fixed maturity securities        
Gain (Loss) on Securities [Line Items]        
Total fair value       265,969
Gross unrealized losses       2,598
Fixed maturity securities, available-for-sale 1,570,605     1,433,626
Aggregate net unrealized gain (loss) $ 44,434     $ 37,691
Number of impaired fixed maturities | security   3    
Impairment losses   $ 271    
Bank Loan Portfolio        
Gain (Loss) on Securities [Line Items]        
Number of issuers with impaired loans | issuer       6
Loans from Issuer Experiencing Liquidity Concerns        
Gain (Loss) on Securities [Line Items]        
Number of impaired loans | loan       2
Number of issuers with impaired loans | issuer       1
Allowance for credit losses on impaired loans       $ 5,100
BBB- or better | Fixed maturity securities        
Gain (Loss) on Securities [Line Items]        
Percentage of available for sale securities 99.60%      
Below BBB-        
Gain (Loss) on Securities [Line Items]        
Fixed maturity securities, available-for-sale $ 5,600      
Aggregate net unrealized gain (loss) 17      
ASU 2019-05        
Gain (Loss) on Securities [Line Items]        
Bank loan participations     $ (8,400)  
Cumulative effect of adoption of ASU     7,827  
ASU 2019-05 | Retained Earnings        
Gain (Loss) on Securities [Line Items]        
Cumulative effect of adoption of ASU     $ 7,827  
Bank Holding Company        
Gain (Loss) on Securities [Line Items]        
Carrying value of collateralized loan obligation held 2,300      
Bank Loan Participations        
Gain (Loss) on Securities [Line Items]        
Net investment income 4,100      
Net realized and unrealized losses on investments $ 43,900