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Summary of Significant Accounting Policies (Details 3) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 743,032 $ 691,693
Less accumulated depreciation (357,461) (323,565)
Property and equipment, net 385,571 368,128
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 36,819 36,819
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 104,650 96,804
Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 44,412 42,699
Mobile equipment, information technology, and office furniture [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 104,918 93,620
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 420,368 410,633
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 31,865 $ 11,118