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Reinsurance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reinsurance      
Prepaid Reinsurance Premiums $ 35,182 $ 33,974  
CAR | Reinsurance Recoverable Including Reinsurance Premium Paid [Member] | Concentration of credit risk      
Reinsurance      
Reinsurance receivables on paid and unpaid loss and LAE 130,005 113,544  
Assumed net losses 3,595 5,362 $ 5,444
Prepaid Reinsurance Premiums $ 33,587 $ 32,447