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Rental Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Accumulated depreciation $ 134,955   $ 131,905
Depreciation - Property, plant and equipment 3,338 $ 3,135  
Rental Equipment      
Property, Plant and Equipment [Line Items]      
Accumulated depreciation 12,463   $ 11,145
Depreciation - Property, plant and equipment $ 2,088 $ 1,405