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Details of Selected Balance Sheet Accounts - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 1,155,700	$ 1,174,362
Accumulated depreciation	(815,316)	(790,800)
Property, plant, and equipment, net	340,384	383,562
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	33,622	34,968
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	260,772	267,072
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	240,302	239,986
Completion-related rental equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	504,890	507,755
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	32,936	35,767
Vehicles
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	75,119	81,607
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 8,059	$ 7,207

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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