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PROPERTY, PLANT AND EQUIPMENT, NET | 12 Months Ended
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Dec. 31, 2021
PROPERTY, PLANT AND EQUIPMENT, NET. |
PROPERTY, PLANT AND EQUIPMENT, NET | 6. PROPERTY, PLANT AND EQUIPMENT, NET Property, plant and equipment, net, consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2021
Cost | ​ | ​ | ​ | ​ | ​ | ​
Buildings and plant | ​ | $ | 444,829 | ​ | $ | 468,309
Machinery and equipment | ​ |  | 880,554 | ​ |  | 910,070
Furniture, fixtures and equipment | ​ |  | 55,437 | ​ |  | 59,549
Motor vehicles | ​ |  | 1,123 | ​ |  | 1,176
Less: Accumulated depreciation | ​ |  | (381,685) | ​ |  | (466,549)
Property, plant and equipment, net | ​ | $ | 1,000,258 | ​ | $ | 972,555
Construction in process | ​ |  | 26,828 | ​ |  | 586,555
Total | ​ | $ | 1,027,086 | ​ | $ | 1,559,110
​ Depreciation expense was $47.4 million, $68.7 million and $77.4 million for the years ended December 31, 2019, 2020 and 2021, respectively.

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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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