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Property, Plant and Equipment, Net | 12 Months Ended
--- | ---
Dec. 31, 2021
Property, Plant and Equipment, net |
Property, Plant and Equipment, Net | 7. Property, Plant and Equipment, net ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(in thousands) | ​ | 2021 | ​ | 2020
Compression equipment, facilities and other fleet assets | ​ | $ | 3,273,770 | ​ | $ | 3,439,432
Land and buildings | ​ |  | 43,540 | ​ |  | 45,167
Transportation and shop equipment | ​ |  | 92,490 | ​ |  | 106,868
Computer hardware and software | ​ |  | 76,908 | ​ |  | 84,680
Other | ​ |  | 6,229 | ​ |  | 14,457
Property, plant and equipment | ​ |  | 3,492,937 | ​ |  | 3,690,604
Accumulated depreciation | ​ |  | (1,266,411) | ​ |  | (1,300,930)
Property, plant and equipment, net | ​ | $ | 2,226,526 | ​ | $ | 2,389,674
​ Depreciation expense was $167.6 million, $177.5 million and $172.8 million during the years ended December 31, 2021, 2020 and 2019, respectively. Assets under construction of $30.1 million and $17.6 million at December 31, 2021 and 2020, 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 http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://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 http://asc.fasb.org/extlink&oid=120429125&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 http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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