Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment
Property, plant and equipment, gross	$ 12,300,912	$ 13,112,640
Less: accumulated depreciation and amortization	(8,968,414)	(9,126,933)
Property, Plant and Equipment, Net, Total	3,332,498	3,985,707	$ 4,930,549
Depreciation	689,200	851,800	869,600
Repair and maintenance expense	153,900	154,200	248,600
Interest costs capitalized	700	700	$ 1,500
Land
Property, Plant and Equipment
Property, plant and equipment, gross	22,955	28,261
Building
Property, Plant and Equipment
Property, plant and equipment, gross	130,917	141,365
Drilling rigs and related equipment
Property, Plant and Equipment
Property, plant and equipment, gross	11,702,450	12,487,961
Oilfield hauling and mobile equipment
Property, Plant and Equipment
Property, plant and equipment, gross	243,850	259,150
Other machinery and equipment
Property, Plant and Equipment
Property, plant and equipment, gross	$ 200,740	$ 195,903

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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