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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 1,280,947 $ 1,293,269
Less: Accumulated depreciation (755,108) (726,245)
Total property, plant and equipment, net 525,839 567,024
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 15,948 15,730
Land improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 9,256 9,379
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 $ 129,967 73,211
Rental machinery and equipment    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (in years) 7 years  
Property, plant and equipment, gross $ 933,489 933,667
Machinery and equipment - other    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (in years) 7 years  
Property, plant and equipment, gross $ 58,559 60,182
Furniture, fixtures and computers    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (in years) 5 years  
Property, plant and equipment, gross $ 20,767 19,073
Automobiles and other vehicles    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (in years) 5 years  
Property, plant and equipment, gross $ 32,650 36,796
Aircraft    
Property, Plant and Equipment [Line Items]    
Estimated useful lives (in years) 7 years  
Property, plant and equipment, gross $ 0 16,267
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 10,261 8,027
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 $ 70,050 $ 120,937