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Property, Plant and Equipment - Schedule of Property Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property Plant And Equipment [Abstract]      
Buildings and leasehold improvements, Gross $ 208,184 $ 203,054  
Machinery and equipment 817,202 774,138  
Property, plant and equipment, at cost 1,025,386 977,192  
Less: Accumulated depreciation and amortization (635,969) (581,753)  
Net 389,417 395,439  
Construction in-progress 16,886 22,446  
Land 40,532 41,284  
Property, plant and equipment, net $ 446,835 $ 459,169 $ 401,988