Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Capital leases included in plant, property and equipment	$ 1,700	$ 5,500
Gross property, plant and equipment	1,793,728	1,848,518
Less: Accumulated depreciation	(1,323,828)	(1,368,771)
Property, plant and equipment, net	469,900	479,747	$ 490,255
Land
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	10,621	10,840
Land improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 16,156	14,996
Land improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Land improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	20 years
Buildings and improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 191,072	198,582
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	40 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 1,538,166	1,599,713
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	20 years
Uncompleted construction
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 37,713	$ 24,387