Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment
Property, plant and equipment, gross	$ 13,695,384	$ 13,929,857
Less: accumulated depreciation and amortization	(8,227,514)	(7,820,292)
Property, Plant and Equipment, Net, Total	5,467,870	6,109,565	$ 6,267,583
Depreciation	860,100	835,900	855,400
Repair and maintenance expense	265,600	241,400	151,800
Interest costs capitalized	1,000	2,500	$ 6,700
Land
Property, Plant and Equipment
Property, plant and equipment, gross	43,187	52,000
Buildings
Property, Plant and Equipment
Property, plant and equipment, gross	123,619	134,318
Drilling, workover rigs and related equipment
Property, Plant and Equipment
Property, plant and equipment, gross	13,021,580	12,997,470
Marine Transportation and Supply Vessels
Property, Plant and Equipment
Property, plant and equipment, gross		4,377
Oilfield Hauling and Mobile Equipment
Property, Plant and Equipment
Property, plant and equipment, gross	267,223	272,384
Other Machinery and Equipment
Property, Plant and Equipment
Property, plant and equipment, gross	197,094	172,674
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	$ 30,395	$ 284,348

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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