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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2022
PROPERTY, PLANT AND EQUIPMENT |
PROPERTY, PLANT AND EQUIPMENT | NOTE 6. PROPERTY, PLANT AND EQUIPMENT, NET Property, plant and equipment, net is comprised of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2022 | ​ | 2021
Compression equipment, facilities and other fleet assets | ​ | $ | 3,234,239 | ​ | $ | 3,273,770
Land and buildings | ​ |  | 44,304 | ​ |  | 43,540
Transportation and shop equipment | ​ |  | 93,189 | ​ |  | 92,490
Computer hardware and software | ​ |  | 77,357 | ​ |  | 76,908
Other | ​ |  | 5,754 | ​ |  | 6,229
Property, plant and equipment | ​ |  | 3,454,843 | ​ |  | 3,492,937
Accumulated depreciation | ​ |  | (1,255,590) | ​ |  | (1,266,411)
Property, plant and equipment, net | ​ | $ | 2,199,253 | ​ | $ | 2,226,526
​ Depreciation expense was $155.4 million, $167.6 million and $177.5 million during the years ended December 31, 2022, 2021 and 2020, respectively. Assets under construction of $92.5 million and $30.1 million at December 31, 2022 and 2021, respectively, primarily consisted of compression equipment, facilities and other fleet assets.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126982197&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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