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Accounting Policies - Narrative (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
company
Sep. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Effective U.S. federal income tax expense rate 14.40% 22.40%          
Shareholders' equity $ 821,406 $ 768,969 $ 795,711   $ 778,581 $ 791,050 $ 709,241
Cumulative Effect, Period of Adoption, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Shareholders' equity             8,280
VIE, not primary beneficiary              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Investment in variable interest entities $ 30,500       31,200    
UNITED STATES              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Number of insurance companies | company 5            
BERMUDA              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Number of insurance companies | company 2            
ASU 2019-05 | Cumulative Effect, Period of Adoption, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Bank loan participations       $ (8,400) (8,400)    
Shareholders' equity         (7,827)    
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Shareholders' equity         (265)    
Retained Earnings              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Shareholders' equity $ 78,761 $ 78,344 $ 61,770   89,586 $ 112,729 79,753
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Shareholders' equity             $ 8,280
Retained Earnings | ASU 2019-05 | Cumulative Effect, Period of Adoption, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Shareholders' equity       (7,800) (7,827)    
Retained Earnings | ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Shareholders' equity       $ (265) $ (265)