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Statutory Net Income and Surplus (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Statutory Net Income and Surplus      
Statutory net income $ 75,469    
Statutory capital and surplus $ 704,177    
Period of statutory measurement of income and dividends 12 months    
Maximum available for dividends without approval $ 75,469    
Company's insurance company subsidiaries      
Statutory Net Income and Surplus      
Statutory net income 75,469 $ 86,734 $ 57,982
Statutory capital and surplus $ 704,177 $ 646,820  
Dividend limitation without prior permission, percentage of preceding surplus 10.00%    
Period allowed for Commissioner to object to notice of an extraordinary dividend 30 days    
Restricted net assets amount $ 628,708    
Number of levels of regulatory action, risk-based capital law | item 4    
Minimum statutory capital and surplus or company action level risk-based capital $ 184,601    
Safety Insurance Company      
Statutory Net Income and Surplus      
Statutory capital and surplus 704,177    
Recorded dividends $ 47,585