Other (Income) Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Employee termination benefit costs	$ 1,443	$ 753
Net gains	0	(122)
Other costs to exit activities	364	100
Impaired asset write-downs	9	0
Other	6	163
Other expenses	$ 1,822	$ 894