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Retirement of Long-Lived Assets (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
rental_compressor
hp
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
rental_compressor
hp
Jun. 30, 2014
USD ($)
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]        
Amount of horsepower | hp 32,259   32,259  
Loss on retirement of rental equipment $ 4,373 $ 0 $ 4,373 $ 0
Rental Compressor Unit        
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]        
Number of rental compressors that are not of type, configuration, make or model | rental_compressor 258   258  
Estimated fair value of long-lived assets $ 967   $ 967  
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     $ 4,400