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Summary of Significant Accounting Policies (Details 3) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 1,008,291 $ 998,865
Less accumulated depreciation (446,943) (430,163)
Property and equipment, net 561,348 568,702
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 136,974 136,087
Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 51,815 50,655
Mobile equipment, information technology, and office furniture [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 127,058 125,486
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 624,357 613,060
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 29,436 $ 34,877