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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 1,254,590 $ 1,245,232
Less: Accumulated depreciation (666,334) (620,273)
Total property, plant and equipment, net 588,256 624,959
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 14,176 10,119
Land improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 9,378 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 $ 70,615 74,152
Rental machinery and equipment    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 7 years  
Property, plant and equipment, gross $ 906,542 898,134
Machinery and equipment - other    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 7 years  
Property, plant and equipment, gross $ 60,223 60,250
Furniture, fixtures and computers    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 5 years  
Property, plant and equipment, gross $ 18,272 18,240
Automobiles and other vehicles    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives in Years 5 years  
Property, plant and equipment, gross $ 43,896 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 $ 8,314 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 $ 106,907 $ 102,432