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Property, Plant and Equipment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		$ 485,107	$ 440,994
Accumulated depreciation and amortization		(328,920)	(306,643)
Property, plant and equipment, net		156,187	134,351
Depreciation and amortization		43,945	38,472	$ 39,915
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		166,087	151,339
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		59,116	58,205
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		22,123	20,655
Computer hardware/software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		104,916	98,415
Land, buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		113,020	97,937
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		10,236	14,443
Finance lease right-of-use assets (1)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	[1]	$ 9,609	$ 0
[1] Finance lease right-of-use assets are recorded net of accumulated amortization. Prior to the adoption of ASC 842 on January 1, 2019, assets under capital leases were recorded as machinery and equipment or computer hardware/software.

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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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