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Property and equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment, Net [Abstract]
Property & equipment, excluding rental equipment, gross	$ 279,043	$ 287,112
Less: accumulated depreciation	(143,677)	(121,713)
Property & equipment, net	135,366	165,399
Property & equipment, net	152,212	186,667
Depreciation expense	$ 35,636	38,388	$ 37,414
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	$ 10,157	11,467
Buildings and leasehold improvements
Property, Plant and Equipment, Net [Abstract]
Property & equipment, excluding rental equipment, gross	$ 75,947	83,983
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	$ 42,248	39,986
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	$ 131,860	128,879
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	$ 5,626	6,866
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	$ 8,660	10,090
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	$ 4,545	5,841
Rental equipment
Property, Plant and Equipment, Net [Abstract]
Rental equipment	69,475	76,908
Less: accumulated depreciation	(52,629)	(55,640)
Property & equipment, net	$ 16,846	$ 21,268
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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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-Name Accounting Standards Codification
-Topic 210
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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.

+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ 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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