Other (Income) Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Income and Expenses [Abstract]
Employee termination benefit costs	$ 769	$ 1,695	$ 2,212	$ 2,448
Net gains	(1,097)	(88)	(1,097)	(210)
Other costs to exit activities	100	247	464	347
Impaired asset write-downs	104	281	113	281
Other	(756)	(63)	(750)	100
Other (income) expenses, net	$ (880)	$ 2,072	$ 942	$ 2,966