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Rental Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Property, Plant and Equipment [Line Items]          
Accumulated depreciation $ 128,090   $ 128,090   $ 125,629
Depreciation - Property, plant and equipment     6,242 $ 5,560  
Rental Equipment          
Property, Plant and Equipment [Line Items]          
Accumulated depreciation 10,447   10,447   $ 9,413
Depreciation - Property, plant and equipment $ 1,577 $ 1,396 $ 2,983 $ 2,804