Other (Expense) Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other Income and Expenses [Abstract]
Interest income	$ 143	$ 124
Other nonoperating income	155	158
Insurance policy (expense) income	(49)	170
Other nonoperating expense	(3)	(3)
Other (expense) income, net	$ 246	$ 449