Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment
Gross property, plant and equipment	$ 1,108,427	$ 1,017,712
Less: accumulated depreciation	(775,334)	(763,304)
Net property, plant and equipment	333,093	254,408
Land
Property, Plant and Equipment
Gross property, plant and equipment	17,287	18,180
Buildings and leasehold improvements
Property, Plant and Equipment
Gross property, plant and equipment	120,506	120,649
Operating equipment
Property, Plant and Equipment
Gross property, plant and equipment	683,027	606,089
Computer software
Property, Plant and Equipment
Gross property, plant and equipment	22,194	22,925
Furniture and fixtures
Property, Plant and Equipment
Gross property, plant and equipment	5,480	6,222
Vehicles
Property, Plant and Equipment
Gross property, plant and equipment	$ 259,933	$ 243,647

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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