Property, Plant and Equipment - Schedule of Property Plant And Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Abstract]
Buildings and leasehold improvements, Gross	$ 203,054	$ 192,290
Machinery and equipment	774,138	685,249
Property, plant and equipment, at cost	977,192	877,539
Less: Accumulated depreciation and amortization	(581,753)	(535,407)
Net	395,439	342,132
Construction in-progress	22,446	24,049
Land	41,284	35,807
Property, plant and equipment, net	$ 459,169	$ 401,988	$ 439,340