Details of Selected Balance Sheet Accounts - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 1,180,389	$ 1,224,308
Accumulated depreciation	(771,241)	(764,584)
Property, plant, and equipment, net	409,148	459,724
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	34,272	37,507
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	264,841	273,384
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	239,793	246,826
Completion Services equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	511,479	510,737
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	35,052	45,309
Vehicles
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	86,189	97,264
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 8,763	$ 13,281