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Rental Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Property, Plant and Equipment [Line Items]          
Accumulated depreciation $ 130,606   $ 130,606   $ 125,629
Depreciation - Property, plant and equipment     9,388 $ 8,631  
Rental Equipment          
Property, Plant and Equipment [Line Items]          
Accumulated depreciation 11,247   11,247   $ 9,413
Depreciation - Property, plant and equipment $ 1,808 $ 1,449 $ 4,790 $ 4,253