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Property and Equipment, Identifiable Intangible Assets and Goodwill
6 Months Ended
Jun. 30, 2022
Property and Equipment and Identifiable Intangible Assets  
Property and Equipment, Identifiable Intangible Assets and Goodwill Property and Equipment and Identifiable Intangible Assets
Property and Equipment
Property and equipment consisted of the following (in thousands):
June 30,
2022
December 31,
2021
Compression and treating equipment$3,572,197 $3,522,083 
Computer equipment56,104 54,013 
Automobiles and vehicles33,579 31,919 
Leasehold improvements8,849 8,847 
Buildings5,334 5,334 
Furniture and fixtures1,106 1,105 
Land77 77 
Total property and equipment, gross3,677,246 3,623,378 
Less: accumulated depreciation and amortization(1,498,863)(1,401,042)
Total property and equipment, net$2,178,383 $2,222,336 
Depreciation is calculated using the straight-line method over the estimated useful lives of the assets as follows:
Compression equipment, acquired new25 years
Compression equipment, acquired used
5 - 25 years
Furniture and fixtures
3 - 10 years
Vehicles and computer equipment
1 - 10 years
Buildings
5 years
Leasehold improvements5 years
Depreciation expense on property and equipment and loss (gain) on disposition of assets were as follows (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
 2022202120222021
Depreciation expense$51,614 $51,882 $103,334 $105,567 
Loss (gain) on disposition of assets1,031 (1,105)852 (2,360)
On a quarterly basis, we evaluate the future deployment of our idle fleet under current market conditions. For the six months ended June 30, 2022, we determined to retire 10 compressor units for a total of approximately 1,400 horsepower that were previously used to provide compression services in our business. As a result, we recorded an impairment of compression equipment of $0.4 million for the six months ended June 30, 2022.
For the three and six months ended June 30, 2021, we determined to retire 10 and 22 compressor units, respectively, for a total of approximately 4,000 and 9,600 horsepower, respectively, that were previously used to provide compression services in our business. As a result, we recorded impairments of compression equipment of $2.4 million and $5.0 million for the three and six months ended June 30, 2021, respectively.
The primary causes for these impairments were: (i) units were not considered marketable in the foreseeable future, (ii) units were subject to excessive maintenance costs or (iii) units were unlikely to be accepted by customers due to certain performance characteristics of the unit, such as the inability to meet current quoting criteria without excessive retrofitting costs. These compression units were written down to their respective estimated salvage values, if any.
No impairment was recorded for the three months ended June 30, 2022.
Identifiable Intangible Assets
Identifiable intangible assets, net consisted of the following (in thousands):
Customer RelationshipsTrade NamesTotal
Net balance as of December 31, 2021$276,848 $27,563 $304,411 
Amortization expense(13,052)(1,637)(14,689)
Net balance as of June 30, 2022$263,796 $25,926 $289,722 
Accumulated amortization of intangible assets was $260.9 million and $246.3 million as of June 30, 2022 and December 31, 2021, respectively.