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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment
Gross property, plant and equipment	$ 1,017,712	$ 1,055,123
Less: accumulated depreciation	(763,304)	(790,712)
Net property, plant and equipment	254,408	264,411
Land
Property, Plant and Equipment
Gross property, plant and equipment	18,180	19,474
Buildings and leasehold improvements
Property, Plant and Equipment
Gross property, plant and equipment	120,649	122,289
Operating equipment
Property, Plant and Equipment
Gross property, plant and equipment	606,089	645,576
Computer software
Property, Plant and Equipment
Gross property, plant and equipment	22,925	24,681
Furniture and fixtures
Property, Plant and Equipment
Gross property, plant and equipment	6,222	6,692
Vehicles
Property, Plant and Equipment
Gross property, plant and equipment	$ 243,647	$ 236,411

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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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