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PROPERTY, PLANT AND EQUIPMENT, NET | 12 Months Ended
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Dec. 31, 2020
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: ​
​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, | ​ | At December 31,
​ |  | 2019 |  | 2020
​ | ​ | $ | ​ | $
Buildings |  | 453,712 |  | 533,647
Leasehold improvements |  | 14,225 |  | 14,804
Machinery |  | 1,074,460 |  | 1,191,780
Furniture, fixtures and equipment |  | 64,117 |  | 75,656
Motor vehicles |  | 6,351 |  | 7,643
Land | ​ | 20,451 | ​ | 20,231
​ |  | 1,633,316 |  | 1,843,761
Accumulated depreciation |  | (598,297) |  | (827,601)
Impairment | ​ | (45,437) |  | (52,149)
Subtotal |  | 989,582 |  | 964,011
Construction in process |  | 56,453 |  | 193,720
Property, plant and equipment, net |  | 1,046,035 |  | 1,157,731
​ Depreciation expense of property, plant and equipment was $120,834, $148,034 and $197,600 for the years ended December 31, 2018, 2019 and 2020, respectively. Construction in process primarily represents production facilities under construction and the machinery under installation.

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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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