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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,191,864	$ 1,204,067
Less: Accumulated depreciation	(919,157)	(875,635)
Total property, plant and equipment, net	272,707	328,432
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	30,869	30,724
Land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,620	7,193
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	121,105	116,182
Rental machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 897,398	882,979
Machinery and equipment - other
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Property, plant and equipment, gross	$ 54,842	60,182
Furniture, fixtures and computers
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 16,928	17,251
Automobiles and other vehicles
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Property, plant and equipment, gross	$ 25,948	28,734
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	12,773	14,258
Construction in progress - machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 24,381	$ 46,564
Minimum | Land improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	8 years
Minimum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	13 years
Minimum | Rental machinery and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Minimum | Furniture, fixtures and computers
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Minimum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Maximum | Land improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Maximum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	39 years
Maximum | Rental machinery and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Maximum | Furniture, fixtures and computers
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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