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Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment, Net [Abstract]
Property & equipment, excluding rental equipment, gross	$ 352,293	$ 343,569
Less: accumulated depreciation	(180,717)	(160,787)
Property & equipment, net	171,576	182,782
Property & equipment, net	177,358	197,281
Depreciation expense	$ 33,148	34,401	$ 35,636
Minimum
Property, Plant and Equipment, Net [Abstract]
Estimated useful life, property and equipment	3 years
Maximum
Property, Plant and Equipment, Net [Abstract]
Estimated useful life, property and equipment	30 years
Land
Property, Plant and Equipment, Net [Abstract]
Property & equipment, excluding rental equipment, gross	$ 9,755	12,408
Buildings and leasehold improvements
Property, Plant and Equipment, Net [Abstract]
Property & equipment, excluding rental equipment, gross	$ 103,761	90,909
Buildings and leasehold improvements | Minimum
Property, Plant and Equipment, Net [Abstract]
Estimated useful life, property and equipment	5 years
Buildings and leasehold improvements | Maximum
Property, Plant and Equipment, Net [Abstract]
Estimated useful life, property and equipment	30 years
Computer equipment
Property, Plant and Equipment, Net [Abstract]
Property & equipment, excluding rental equipment, gross	$ 54,721	42,074
Computer equipment | Minimum
Property, Plant and Equipment, Net [Abstract]
Estimated useful life, property and equipment	3 years
Computer equipment | Maximum
Property, Plant and Equipment, Net [Abstract]
Estimated useful life, property and equipment	5 years
Machinery & equipment
Property, Plant and Equipment, Net [Abstract]
Property & equipment, excluding rental equipment, gross	$ 162,110	169,203
Machinery & equipment | Minimum
Property, Plant and Equipment, Net [Abstract]
Estimated useful life, property and equipment	5 years
Machinery & equipment | Maximum
Property, Plant and Equipment, Net [Abstract]
Estimated useful life, property and equipment	10 years
Furniture & fixtures
Property, Plant and Equipment, Net [Abstract]
Property & equipment, excluding rental equipment, gross	$ 6,631	6,338
Furniture & fixtures | Minimum
Property, Plant and Equipment, Net [Abstract]
Estimated useful life, property and equipment	3 years
Furniture & fixtures | Maximum
Property, Plant and Equipment, Net [Abstract]
Estimated useful life, property and equipment	10 years
Vehicles
Property, Plant and Equipment, Net [Abstract]
Property & equipment, excluding rental equipment, gross	$ 6,160	8,048
Vehicles | Minimum
Property, Plant and Equipment, Net [Abstract]
Estimated useful life, property and equipment	3 years
Vehicles | Maximum
Property, Plant and Equipment, Net [Abstract]
Estimated useful life, property and equipment	5 years
Construction in progress
Property, Plant and Equipment, Net [Abstract]
Property & equipment, excluding rental equipment, gross	$ 9,155	14,589
Rental equipment
Property, Plant and Equipment, Net [Abstract]
Rental equipment	9,535	70,679
Less: accumulated depreciation	(3,753)	(56,180)
Property & equipment, net	$ 5,782	$ 14,499
Rental equipment | Minimum
Property, Plant and Equipment, Net [Abstract]
Estimated useful life, property and equipment	3 years
Rental equipment | Maximum
Property, Plant and Equipment, Net [Abstract]
Estimated useful life, property and equipment	10 years

X

- Definition

Accumulated Depreciation, Depletion and Amortization Property, Plant and Equipment Excluding Rental Equipment

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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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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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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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