Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment
Property, plant and equipment, gross	$ 13,112,640	$ 13,615,622
Less: accumulated depreciation and amortization	(9,126,933)	(8,685,073)
Property, Plant and Equipment, Net, Total	3,985,707	4,930,549	$ 5,467,870
Depreciation	851,800	869,600	860,600
Repair and maintenance expense	154,200	248,600	265,600
Interest costs capitalized	700	1,500	$ 1,000
Land
Property, Plant and Equipment
Property, plant and equipment, gross	28,261	33,931
Building
Property, Plant and Equipment
Property, plant and equipment, gross	141,365	132,603
Drilling, workover rigs and related equipment
Property, Plant and Equipment
Property, plant and equipment, gross	12,487,961	12,948,504
Oilfield Hauling and Mobile Equipment
Property, Plant and Equipment
Property, plant and equipment, gross	259,150	270,826
Other Machinery and Equipment
Property, Plant and Equipment
Property, plant and equipment, gross	$ 195,903	192,081
Oil and Gas Properties
Property, Plant and Equipment
Property, plant and equipment, gross		12,286
Construction-in-process
Property, Plant and Equipment
Property, plant and equipment, gross		$ 25,391

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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The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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