Borrowings Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 07, 2016
Line of Credit Facility [Line Items]
Short-term Debt	$ 0
Long Term Debt, Original Debt, Amount			$ 15,000
Long-term Debt	10,313	$ 14,063
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 10,000
Line of Credit Facility, Interest Rate Spread	2.25%
Long-term Debt [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate at Period End	3.67%	2.91%
Line of Credit Facility, Interest Rate Spread	2.25%