Other (Income) Expenses, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Income and Expenses [Abstract]
Employee termination benefit costs	$ 1,037	$ 2,536	$ 3,249	$ 4,947
Net gains	(1,262)	(4,821)	(2,359)	(4,815)
Other costs to exit activities	11	327	475	495
Impaired asset write-downs	0	539	113	820
Contingent consideration adjustments	412	0	412	0
Other	430	182	(320)	282
Other (income) expenses, net	$ 628	$ (1,237)	$ 1,570	$ 1,729