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Summary of Significant Accounting Policies (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 771,146 $ 691,693
Less accumulated depreciation (368,480) (323,565)
Property and equipment, net 402,666 368,128
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 36,876 36,819
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 106,269 96,804
Buildings [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 20  
Buildings [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 40  
Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 46,205 42,699
Improvements [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 10  
Improvements [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 15  
Mobile equipment, information technology, and office furniture [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 109,702 93,620
Mobile equipment, information technology, and office furniture [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3  
Mobile equipment, information technology, and office furniture [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 7  
Machinery and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 437,433 410,633
Machinery and equipment [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 7  
Machinery and equipment [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 12  
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 34,661 $ 11,118