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Rental Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Property, Plant and Equipment [Line Items]          
Accumulated depreciation $ 138,022   $ 138,022   $ 131,905
Depreciation - Property, plant and equipment     6,868 $ 6,242  
Rental Equipment          
Property, Plant and Equipment [Line Items]          
Accumulated depreciation 12,417   12,417   $ 11,145
Depreciation - Property, plant and equipment $ 2,234 $ 1,577 $ 4,323 $ 2,983