Rental Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ (105,791)		$ (105,791)		$ (100,497)
Depreciation			14,196	$ 7,764
Rental Equipment
Property, Plant and Equipment [Line Items]
Accumulated depreciation	(7,363)		(7,363)		$ (3,435)
Depreciation	$ 2,018	$ 717	$ 5,683	$ 1,361