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Property, Plant and Equipment, Net | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, Net | 7. Property, Plant and Equipment, net Property, plant and equipment, net, consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2020 | ​ | 2019
Compression equipment, facilities and other fleet assets | ​ | $ | 3,439,432 | ​ | $ | 3,653,930
Land and buildings | ​ |  | 45,167 | ​ |  | 50,743
Transportation and shop equipment | ​ |  | 106,868 | ​ |  | 116,057
Computer hardware and software | ​ |  | 84,680 | ​ |  | 93,695
Other | ​ |  | 14,457 | ​ |  | 15,308
Property, plant and equipment | ​ |  | 3,690,604 | ​ |  | 3,929,733
Accumulated depreciation | ​ |  | (1,300,930) | ​ |  | (1,370,335)
Property, plant and equipment, net | ​ | $ | 2,389,674 | ​ | $ | 2,559,398
​ Depreciation expense was $177.5 million, $172.8 million and $158.4 million during the years ended December 31, 2020, 2019 and 2018, respectively. Assets under construction of $17.6 million and $51.0 million at December 31, 2020 and 2019, respectively, were primarily included in 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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