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Rental Equipment
 9 Months Ended
Sep. 30, 2021
Property, Plant and Equipment [Abstract]  
Rental Equipment Rental Equipment
Our rental equipment and associated accumulated depreciation as of September 30, 2021 and December 31, 2020, respectively, consisted of the following:
September 30, 2021December 31, 2020
(in thousands)
Compressor units$397,426 $379,623 
Work-in-process3,797 3,764 
Rental equipment401,223 383,387 
Accumulated depreciation(192,827)(175,802)
Rental equipment, net of accumulated depreciation$208,396 $207,585 
We evaluated our rental equipment for potential impairment as of September 30, 2021, and determined that no such impairment existed as of that date.