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Rental Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Property, Plant and Equipment [Line Items]          
Accumulated depreciation $ (111,377)   $ (111,377)   $ (107,094)
Depreciation     13,451 $ 14,196  
Rental Equipment          
Property, Plant and Equipment [Line Items]          
Accumulated depreciation (9,667)   (9,667)   $ (8,322)
Depreciation $ 1,508 $ 2,018 $ 4,951 $ 5,683