Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Capital leases included in plant, property and equipment	$ 16,000	$ 22,300
Gross property, plant and equipment	1,916,469	2,186,407
Less: Accumulated depreciation	(1,352,434)	(1,523,163)
Property, plant and equipment, net	564,035	663,244	$ 710,465
Land
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	10,932	15,721
Land improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 15,277	15,898
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	$ 191,356	205,409
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	$ 1,661,914	1,861,965
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	$ 36,990	$ 87,414