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Details of Selected Balance Sheet Accounts - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 1,164,721 $ 1,174,362
Accumulated depreciation (809,316) (790,800)
Property, plant, and equipment, net 355,405 383,562
Land    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 34,661 34,968
Buildings and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 265,793 267,072
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 242,849 239,986
Completion-related rental equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 505,795 507,755
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 32,329 35,767
Vehicles    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 77,415 81,607
Construction in progress    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 5,879 $ 7,207