Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment
Property, plant and equipment, gross	$ 13,615,622	$ 13,695,384
Less: accumulated depreciation and amortization	(8,685,073)	(8,227,514)
Property, Plant and Equipment, Net, Total	4,930,549	5,467,870	$ 6,109,565
Depreciation	869,600	860,600	835,900
Repair and maintenance expense	248,600	265,600	241,400
Interest costs capitalized	1,500	1,000	$ 2,500
Land
Property, Plant and Equipment
Property, plant and equipment, gross	33,931	43,187
Building
Property, Plant and Equipment
Property, plant and equipment, gross	132,603	123,619
Drilling, workover rigs and related equipment
Property, Plant and Equipment
Property, plant and equipment, gross	12,948,504	13,021,580
Oilfield Hauling and Mobile Equipment
Property, Plant and Equipment
Property, plant and equipment, gross	270,826	267,223
Other Machinery and Equipment
Property, Plant and Equipment
Property, plant and equipment, gross	192,081	197,094
Oil and Gas Properties
Property, Plant and Equipment
Property, plant and equipment, gross	12,286	12,286
Construction in Progress
Property, Plant and Equipment
Property, plant and equipment, gross	$ 25,391	$ 30,395

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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