Other Income (Expense), Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other Income and Expenses [Abstract]
Interest income	$ 13	$ 53	$ 45	$ 240
Other nonoperating income	65	2	110	0
Insurance policy income (expense)	78	(184)	(55)	(328)
Other income (expense), net	$ 156	$ (129)	$ 100	$ (88)