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Inventory Allowance and Retirement of Long-Lived Assets (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
compressor
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]        
Inventory allowance $ 3,350 $ 3,350 $ 0  
Allowance for obsolescence 3,371 3,371   $ 19
Loss on retirement of rental equipment $ 1,512 $ 1,512 $ 0  
Rental Compressor Unit        
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]        
Number of units retired | compressor   327    
Rental Compressor Unit | Loss On Retirement of Rental Equipment        
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]        
Loss on retirement of rental equipment   $ 1,500