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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance, beginning of period $ 302 $ 148 $ 143
Charged to costs and expenses (219) 192 45
Deductions (28) (38) (40)
Balance, end of period $ 55 $ 302 $ 148