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Property and Equipment
3 Months Ended
Mar. 31, 2022
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
The historical costs of our property and equipment and related accumulated depreciation and amortization balances were as follows at the dates indicated (in thousands):
Estimated
Useful LifeMarch 31,December 31,
in Years20222021
Tractors and trailers
5 – 6
$109,643 $106,558 
Field equipment
2 – 5
22,904 22,851 
Finance lease ROU assets (1)
3 – 6
22,349 22,349 
Pipeline and related facilities
20 – 25
20,363 20,336 
Linefill and base gas (2)
N/A3,922 3,922 
Buildings
5 – 39
16,163 16,163 
Office equipment
2 – 5
2,880 2,060 
LandN/A2,008 2,008 
Construction in progressN/A2,036 3,396 
Total202,268 199,643 
Less accumulated depreciation and amortization(115,725)(111,607)
Property and equipment, net$86,543 $88,036 
_______________
(1)Our finance lease right-of-use (“ROU)” assets arise from leasing arrangements for the right to use various classes of underlying assets including tractors, trailers, a tank storage and throughput arrangement and office equipment (see Note 13 for further information). Accumulated amortization of the assets presented as “Finance lease ROU assets” was $11.0 million and $9.8 million at March 31, 2022 and December 31, 2021, respectively.
(2)Linefill and base gas represents crude oil in the VEX pipeline and storage tanks we own, and the crude oil is recorded at historical cost.
Components of depreciation and amortization expense were as follows for the periods indicated (in thousands):

Three Months Ended
March 31,
20222021
Depreciation and amortization, excluding amounts under finance leases$3,805 $3,913 
Amortization of property and equipment under finance leases1,208 1,140 
Total depreciation and amortization$5,013 $5,053