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Summary of Significant Accounting Policies (Details 3) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 721,476 $ 691,693
Less accumulated depreciation (347,463) (323,565)
Property and equipment, net 374,013 368,128
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 103,780 96,804
Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 42,949 42,699
Office Equipment and Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 98,460 93,620
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 420,963 410,633
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 18,505 $ 11,118