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Property and Equipment, Identifiable Intangible Assets and Goodwill (Tables)
 3 Months Ended
Mar. 31, 2022
Property and Equipment and Identifiable Intangible Assets  
Schedule of property and equipment
Property and equipment consisted of the following (in thousands):
March 31,
2022		December 31,
2021
Compression and treating equipment$3,539,222 $3,522,083 
Computer equipment55,396 54,013 
Automobiles and vehicles32,506 31,919 
Leasehold improvements8,849 8,847 
Buildings5,334 5,334 
Furniture and fixtures1,106 1,105 
Land77 77 
Total property and equipment, gross3,642,490 3,623,378 
Less: accumulated depreciation and amortization(1,449,483)(1,401,042)
Total property and equipment, net$2,193,007 $2,222,336 
Depreciation expense on property and equipment and gain on disposition of assets were as follows (in thousands):
Three Months Ended March 31,
 20222021
Depreciation expense$51,720 $53,685 
Gain on disposition of assets179 1,255 
Schedule of estimated useful lives of property, plant, and equipment
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
Schedule of 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(6,526)(818)(7,344)
Net balance as of March 31, 2022$270,322 $26,745 $297,067