Other Income, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Income and Expenses [Abstract]
Interest income	$ 332	$ 368	$ 538
Other nonoperating income	789	321	152
Insurance Policy Expense (Income), Net	(228)	(409)	(427)
Other nonoperating expense	(10)	(10)	(10)
Other income, net	$ 883	$ 270	$ 253