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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 1,240,786 $ 1,110,862
Less: Accumulated depreciation (597,473) (530,720)
Total property, plant and equipment, net 643,313 580,142
Land and land Improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 19,949 21,804
Land and land Improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 8 years  
Land and land Improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 15 years  
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 39 years  
Property, plant and equipment, gross $ 74,023 69,827
Rental machinery and equipment    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 7 years  
Property, plant and equipment, gross $ 890,542 763,722
Machinery and equipment - other    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 7 years  
Property, plant and equipment, gross $ 60,753 64,648
Furniture, fixtures and computers    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 5 years  
Property, plant and equipment, gross $ 18,081 17,915
Automobiles and other vehicles    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 5 years  
Property, plant and equipment, gross $ 48,913 37,417
Aircraft    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 7 years  
Property, plant and equipment, gross $ 16,267 14,868
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 7,352 6,353
Leasehold improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 7 years  
Leasehold improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 15 years  
Construction in progress - machinery and equipment and buildings    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 104,906 $ 114,308