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Rental Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Accumulated depreciation $ 129,196   $ 125,629
Depreciation - Property, plant and equipment 3,135 $ 2,777  
Rental Equipment      
Property, Plant and Equipment [Line Items]      
Accumulated depreciation 10,044   $ 9,413
Depreciation - Property, plant and equipment $ 1,405 $ 1,407