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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 1,254,963 $ 1,250,194
Less: Accumulated depreciation (869,326) (833,704)
Total property, plant and equipment, net 385,637 416,490
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 32,780 32,945
Land improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 8,424 8,316
Land improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 8 years  
Land improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 15 years  
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 124,618 125,088
Buildings and improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 13 years  
Buildings and improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 39 years  
Rental machinery and equipment    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 7 years  
Property, plant and equipment, gross $ 893,344 887,064
Machinery and equipment - other    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 7 years  
Property, plant and equipment, gross $ 61,978 61,796
Furniture, fixtures and computers    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 5 years  
Property, plant and equipment, gross $ 21,044 24,745
Automobiles and other vehicles    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 5 years  
Property, plant and equipment, gross $ 29,757 29,696
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 15,562 15,392
Leasehold improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 7 years  
Leasehold improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives 15 years  
Construction in progress - machinery and equipment and land improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 67,456 $ 65,152