Other Income, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Income and Expenses [Abstract]
Interest income	$ 129	$ 129	$ 246
Other nonoperating income	5	11	183
Insurance Policy Expense (Income), Net	(43)	(40)	(488)
Other Nonoperating Expense	0	(106)	0
Other income (expense), net	$ 91	$ (6)	$ (59)