Schedule V (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]
Uncollectible Premium Liability, Beg. Balance	$ 144	$ 132	$ 34
Charged to Costs and Expenses	294	356	198
Deductions	(54)	(344)	(100)
Uncollectible Premium Liability, End. Balance	$ 384	$ 144	$ 132