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PROPERTY AND EQUIPMENT, NET - Depreciation (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Depreciation expense |  |  |
Depreciation of property and equipment | ¥ 1,543,130 | ¥ 1,057,171 | ¥ 682,451
Cost of revenue |  |  |
Depreciation expense |  |  |
Depreciation of property and equipment | 1,418,846 | 1,045,446 | 674,560
General and administrative expenses |  |  |
Depreciation expense |  |  |
Depreciation of property and equipment | 120,604 | 10,448 | 7,319
Research and development expenses |  |  |
Depreciation expense |  |  |
Depreciation of property and equipment | ¥ 3,680 | ¥ 1,277 | ¥ 572

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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