Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Income and Expenses [Abstract]
Interest income	$ 400	$ 38	$ 579	$ 83
Other nonoperating expense	(231)	(156)		(46)
Other nonoperating income			16
Insurance policy (expense) income	(32)	221	(32)	166
Other income, net	$ 137	$ 103	$ 563	$ 203