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Summary of Significant Accounting Policies (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Subsidiary
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Principles of Consolidation [Abstract]      
Number of insurance subsidiaries owned by the parent | Subsidiary 4    
Number of non-insurance subsidiaries owned by the parent | Subsidiary 1    
Intangibles [Abstract]      
Impairment of intangible assets $ 0    
Investments:      
Estimated fair value 0 $ 1,066  
Immaterial Error Correction [Abstract]      
Increase to gross unrealized holding loss, before tax 23,130 (13,047)  
Increase to gross unrealized holding loss, after tax 18,273 (10,308)  
Decrease to reclassification adjustment for net realized gains, before tax (353) (580)  
Decrease to reclassification adjustment for net realized gains, after tax $ (279) $ (458)  
Recently Issued Accounting Standards [Abstract]      
Federal corporate tax rate 21.00% 21.00% 35.00%
Reduction in tax rate 14.00%    
Adoption of New Accounting Pronouncements [Abstract]      
Classified distributions from equity method investees as cash flows from operating activities $ 379 $ 10,777  
Revenues within scope of updated accounting guidance 198,179 185,553  
ROU asset 5,476    
Lease liability 5,675    
ASU 2016-01 [Member] | Retained Earnings [Member]      
Adoption of New Accounting Pronouncements [Abstract]      
Cumulative effect adjustment to AOCI and Retained Earnings     $ 9,825
ASU 2016-01 [Member] | Accumulated Other Comprehensive Income (Loss) [Member]      
Adoption of New Accounting Pronouncements [Abstract]      
Cumulative effect adjustment to AOCI and Retained Earnings     (9,825)
ASU 2018-02 [Member] | Retained Earnings [Member]      
Adoption of New Accounting Pronouncements [Abstract]      
Reclassification of standard tax effects on AOCI and retained earnings     (2,100)
ASU 2018-02 [Member] | Accumulated Other Comprehensive Income (Loss) [Member]      
Adoption of New Accounting Pronouncements [Abstract]      
Reclassification of standard tax effects on AOCI and retained earnings     $ 2,100
ASU 2016-15 [Member]      
Adoption of New Accounting Pronouncements [Abstract]      
Classified distributions from equity method investees as cash flows from operating activities 379 10,777  
ASU 2014-09 [Member]      
Adoption of New Accounting Pronouncements [Abstract]      
Revenues within scope of updated accounting guidance $ 190    
Revenues within scope of updated accounting guidance, as a percentage of total revenues (less than) 0.10%    
ASU 2016-02 [Member]      
Adoption of New Accounting Pronouncements [Abstract]      
ROU asset   6,088  
Lease liability   6,088  
Restatement Adjustment [Member]      
Immaterial Error Correction [Abstract]      
Increase to gross unrealized holding loss, before tax   6,099  
Increase to gross unrealized holding loss, after tax   4,818  
Decrease to reclassification adjustment for net realized gains, before tax   (6,099)  
Decrease to reclassification adjustment for net realized gains, after tax   $ (4,818)