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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 1,252,819 $ 1,245,232
Less: Accumulated depreciation (646,935) (620,273)
Total property, plant and equipment, net 605,884 624,959
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 14,047 10,119
Land improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 9,379 9,289
Land improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 8 years  
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 $ 71,144 74,152
Rental machinery and equipment    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 7 years  
Property, plant and equipment, gross $ 904,066 898,134
Machinery and equipment - other    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 7 years  
Property, plant and equipment, gross $ 60,462 60,250
Furniture, fixtures and computers    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 5 years  
Property, plant and equipment, gross $ 18,108 18,240
Automobiles and other vehicles    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 5 years  
Property, plant and equipment, gross $ 48,193 48,402
Aircraft    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 7 years  
Property, plant and equipment, gross $ 16,267 16,267
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 8,196 7,947
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 $ 102,957 $ 102,432