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Property, Plant, and Equipment Property, Plant, and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Abstract]    
Land and improvements $ 16,021 $ 13,021
Buildings and improvements 340,609 324,497
Machinery and equipment 1,464,532 1,404,928
Construction in progress 221,101 175,283
Property, plant and equipment, gross 2,042,263 1,917,729
Less accumulated depreciation (794,602) (729,515)
Property, plant and equipment - net $ 1,247,661 $ 1,188,214