Rental Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ (109,854)		$ (107,094)
Depreciation	4,579	$ 2,815
Rental Equipment
Property, Plant and Equipment [Line Items]
Accumulated depreciation	(8,940)		$ (8,322)
Depreciation	$ 1,744	$ 1,747