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Property, Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Machinery and equipment $ 1,937,914 $ 1,866,263
Buildings and improvements 304,971 299,642
Land improvements 54,277 52,929
Land 11,827 11,827
Office and other equipment 11,951 10,946
Construction in progress 40,204 37,160
Property, plant and equipment, gross, total 2,361,144 2,278,767
Less accumulated depreciation and amortization (1,476,446) (1,401,390)
Property, plant and equipment, net $ 884,698 $ 877,377