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Property and Equipment
6 Months Ended
Jun. 30, 2024
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 LifeJune 30,December 31,
in Years20242023
Tractors and trailers
5 – 6
$117,721 $119,265 
Field equipment
2 – 5
25,094 25,024 
Finance lease ROU assets (1)
3 – 6
35,039 35,724 
Pipeline and related facilities
20 – 25
20,522 20,397 
Linefill and base gas (2)
N/A3,960 3,922 
Buildings
5 – 39
17,066 17,089 
Office equipment
2 – 5
3,000 3,000 
LandN/A4,163 4,163 
Construction in progressN/A4,508 3,385 
Total231,073 231,969 
Less accumulated depreciation and amortization(130,647)(126,904)
Property and equipment, net$100,426 $105,065 
_______________
(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 and a tank storage and throughput arrangement (see Note 13 for further information). Accumulated amortization of the assets presented as “Finance lease ROU assets” was $13.9 million and $11.0 million at June 30, 2024 and December 31, 2023, 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 EndedSix Months Ended
June 30,June 30,
2024202320242023
Depreciation and amortization, excluding amounts under finance leases$3,967 $4,913 $8,026 $9,737 
Amortization of property and equipment under finance leases1,794 1,933 3,668 3,708 
Amortization of intangible assets419 457 841 908 
Total depreciation and amortization$6,180 $7,303 $12,535 $14,353