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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 484,476 $ 474,768
Less: accumulated depreciation (332,557) (318,929)
Net property, plant and equipment 151,919 155,839
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,794 2,929
Building    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 113,213 114,324
Machinery and Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 358,308 345,064
Construction in Progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 10,161 $ 12,451