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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment
Gross property, plant and equipment	$ 1,055,123	$ 1,913,635
Less: accumulated depreciation	(790,712)	(1,396,908)
Net property, plant and equipment	264,411	516,727
Land
Property, Plant and Equipment
Gross property, plant and equipment	19,474	18,945
Building and leasehold improvements
Property, Plant and Equipment
Gross property, plant and equipment	122,289	114,318
Operating equipment
Property, Plant and Equipment
Gross property, plant and equipment	645,576	1,194,071
Computer software
Property, Plant and Equipment
Gross property, plant and equipment	24,681	25,247
Furniture and fixtures
Property, Plant and Equipment
Gross property, plant and equipment	6,692	7,086
Vehicles
Property, Plant and Equipment
Gross property, plant and equipment	$ 236,411	$ 553,968

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- Definition

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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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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