Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 685,431	$ 740,421
Less: Accumulated depreciation	(395,611)	(367,954)
Total property, plant and equipment, net	289,820	372,467
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	26,652	68,562
Buildings and Leasehold Improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	201,834	205,534
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment, gross	$ 456,945	$ 466,325