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Schedule V - Valuation and Qualifying Accounts - (Details) - Allowance for Uncollectible Premiums Receivable [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance, beginning of period $ 70 $ 55 $ 302
Valuation Allowances and Reserves, Additions for Charges to Cost and Expense 7 15 (219)
Deductions 0 0 (28)
Balance, end of period $ 77 $ 70 $ 55