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Rental Equipment, Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Summary of Rental Equipment, Property and Equipment
Our rental equipment and associated accumulated depreciation as of December 31, 2019 and 2018, respectively, consisted of the following (in thousands):

20192018
Compressor units$370,961  $329,697  
Work-in-progress9,129  11,868  
Rental equipment380,090  341,565  
Accumulated depreciation(162,348) (165,459) 
Rental equipment, net of accumulated depreciation$217,742  $176,106  
Property and equipment consists of the following at December 31, 2019 and 2018 (in thousands):

 Useful Lives (Years)20192018
Land —  $1,290  $1,290  
Building3918,632  6,116  
Building and leasehold improvements391,168  808  
Office equipment and furniture52,001  1,492  
Software5573  573  
Machinery and equipment73,492  3,324  
Vehicles37,560  6,292  
Construction in Progress—  —  8,319  
Total34,716  28,214  
Less accumulated depreciation(12,847) (11,570) 
Total$21,869  $16,644  
The following table depicts annual depreciation expense associated with each product line as well as our corporate activities at December 31, 2019, 2018 and 2017 (in thousands):

 201920182017
Rentals$22,596  $21,611  $20,873  
Sales275  271  267  
Service & Maintenance37  22  22  
Corporate235  50  29  
Total$23,143  $21,954  $21,191