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Rental Equipment, Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Schedule of Rental Equipment
Our rental equipment and associated accumulated depreciation as of December 31, 2020 and 2019, respectively, consisted of the following:

December 31,
20202019
(in thousands)
Compressor units$379,623 $370,961 
Work-in-progress3,764 9,129 
Rental equipment383,387 380,090 
Accumulated depreciation(175,802)(162,348)
Rental equipment, net of accumulated depreciation$207,585 $217,742 
Property and equipment consists of the following at December 31, 2020 and 2019:

December 31,
 Useful Lives (Years)20202019
($ in thousands)
Land $1,680 $1,290 
Building3918,977 18,632 
Building and leasehold improvements391,168 1,168 
Office equipment and furniture52,016 2,001 
Software5573 573 
Machinery and equipment73,653 3,492 
Vehicles37,598 7,560 
Total35,665 34,716 
Less accumulated depreciation(13,916)(12,847)
Total$21,749 $21,869 
The following table depicts annual depreciation expense associated with each product line as well as our corporate activities at December 31, 2020 and 2019:

December 31,
 20202019
(in thousands)
Rentals$24,255 $22,596 
Sales281 275 
Service & Maintenance42 37 
Corporate495 235 
Total$25,073 $23,143