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Summary of Significant Accounting Policies (Details 3) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 1,017,965 $ 998,865
Less accumulated depreciation (461,481) (430,163)
Property and equipment, net 556,484 568,702
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 38,651 38,700
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 138,305 136,087
Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 52,128 50,655
Mobile equipment, information technology, and office furniture [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 130,263 125,486
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 627,061 613,060
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 31,557 $ 34,877