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LEASES (Tables) | 12 Months Ended
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Dec. 31, 2020
LEASES |
Schedule of of lease cost | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2019 |  | 2020
​ | ​ | ​ | ​ | ​
Finance lease cost: | ​ | ​ | ​ | ​
- Amortization of right-of-use assets |  | 222,101 |  | 423,075
- Interest on lease liabilities |  | 299,511 |  | 465,692
Operating lease cost |  | 100,469 |  | 195,869
Short-term lease cost |  | 5,004 |  | 19,987
Variable lease cost (Note) | ​ | — | ​ | (55,599)
​ | ​ | ​ | ​ | ​
Total lease cost |  | 627,085 |  | 1,049,024
Note: During the year ended December 31, 2020, the Company was granted lease concessions of RMB55,188 by certain landlords due to the effects of the COVID-19 pandemic. The lease concessions were primarily in the form of rent reduction. Such concessions were recognized as variable lease cost (credit) in the period when the concession was granted. In addition, the Company recognized variable lease cost (credit) of RMB411 in the year ended December 31, 2020 for certain finance leases with floating interest rate.
Schedule of supplemental cash flow information related to leases | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2019 |  | 2020
​ | ​ | ​ | ​ | ​
Cash paid for amounts included in measurement of lease liabilities (Note): |  |  |  |
- Operating cash flows from finance leases |  | (248,417) |  | (389,679)
- Operating cash flows from operating leases |  | (116,295) |  | (141,480)
- Financing cash flows from finance leases |  | (302,679) |  | (198,234)
​ | ​ | ​ | ​ | ​
Non-cash information on lease liabilities arising from obtaining ROU assets |  | ​ |  | ​
- Finance leases |  | 708,757 |  | 1,099,698
- Operating leases |  | 333,775 |  | 553,154
Note: The above table does not include cash paid for purchase of land use rights and initial direct costs of leases of RMB800,431 and RMB744,761 in the years ended December 31, 2019 and 2020 , respectively, which are included in “Payments for purchase of property and equipment and land use rights” in the consolidated statements of cash flows.
Schedule of weighted average remaining lease term and weighted average discount rate for leases | ​
​ | ​ | ​ | ​ | ​
​ |  | As of December 31,
​ |  | 2019 |  | 2020
​ | ​ | ​ | ​ | ​
Weighted average remaining lease term: | ​ | ​ | ​ | ​
- Finance leases |  | 15.2 |  | 13.7
- Operating leases |  | 15.6 |  | 15.6
​ | ​ | ​ | ​ | ​
Weighted average discount rate: | ​ | ​ | ​ | ​
- Finance leases |  | 6.91% |  | 7.00%
- Operating leases |  | 6.35% |  | 6.23%
​
Summary of maturities of lease liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, 2019 | ​ | As of December 31, 2020
​ | ​ | ​ | ​ | ​ | ​ | Total of | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Total of | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | finance lease | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | finance lease | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Other | ​ | and other | ​ | Operating | ​ | ​ | ​ | ​ | ​ | Other | ​ | and other | ​ | Operating | ​ | ​
​ | ​ | Finance lease | ​ | financing | ​ | financing | ​ | lease | ​ | ​ | ​ | Finance lease | ​ | financing | ​ | financing | ​ | lease | ​ | ​
​ |  | obligations |  | obligations |  | obligations |  | obligations |  | Total |  | obligations |  | obligations |  | obligations |  | obligations |  | Total
Within 1 year |  | 502,261 |  | 32,232 |  | 534,493 |  | 97,993 |  | 632,486 |  | 577,933 |  | 225,350 |  | 803,283 |  | 180,447 |  | 983,730
After 1 year but within 2 years |  | 399,200 |  | 37,462 |  | 436,662 |  | 72,046 |  | 508,708 |  | 600,348 |  | 354,625 |  | 954,973 |  | 190,243 |  | 1,145,216
After 2 years but within 3 years |  | 399,843 |  | 72,845 |  | 472,688 |  | 64,151 |  | 536,839 |  | 620,461 |  | 356,204 |  | 976,665 |  | 149,300 |  | 1,125,965
After 3 years but within 4 years |  | 414,126 |  | 69,248 |  | 483,374 |  | 64,086 |  | 547,460 |  | 650,855 |  | 377,930 |  | 1,028,785 |  | 151,545 |  | 1,180,330
After 4 years but within 5 years |  | 429,902 |  | 65,688 |  | 495,590 |  | 64,547 |  | 560,137 |  | 681,090 |  | 361,073 |  | 1,042,163 |  | 151,063 |  | 1,193,226
After 5 years |  | 5,905,408 |  | 163,480 |  | 6,068,888 |  | 880,855 |  | 6,949,743 |  | 7,792,794 |  | 723,755 |  | 8,516,549 |  | 1,839,384 |  | 10,355,933
Total |  | 8,050,740 |  | 440,955 |  | 8,491,695 |  | 1,243,678 |  | 9,735,373 |  | 10,923,481 |  | 2,398,937 |  | 13,322,418 |  | 2,661,982 |  | 15,984,400
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Less: total future interest |  | (3,387,232) |  | (121,742) |  | (3,508,974) |  | (478,541) |  | (3,987,515) |  | (4,343,379) |  | (578,822) |  | (4,922,201) |  | (1,032,829) |  | (5,955,030)
Less: estimated construction costs |  | — |  | (9,127) |  | (9,127) |  | — |  | (9,127) |  | — |  | (47,924) |  | (47,924) |  | - |  | (47,924)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Present value of lease and other financing obligations |  | 4,663,508 |  | 310,086 |  | 4,973,594 |  | 765,137 |  | 5,738,731 |  | 6,580,102 |  | 1,772,191 |  | 8,352,293 |  | 1,629,153 |  | 9,981,446
Including: |  |  |  |  |  | ​ |  | ​ |  | ​ |  |  |  |  |  | ​ |  | ​ |  | ​
- Current portion |  | ​ |  | ​ |  | 222,473 |  | 55,139 |  | 277,612 |  | ​ |  | ​ |  | 254,412 |  | 86,258 |  | 340,670
- Non-current portion |  | ​ |  | ​ |  | 4,751,121 |  | 709,998 |  | 5,461,119 |  | ​ |  | ​ |  | 8,097,881 |  | 1,542,895 |  | 9,640,776
Schedule of assets to secure lease and other financing obligations | ​
​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | 2019 |  | 2020
​ | ​ | ​ | ​ | ​
Accounts receivable |  | — |  | 128,353
Property and equipment, net |  | — |  | 578,777
​ |  | — |  | 707,130

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- Definition Tabular disclosure of undiscounted cash flows of lessee's lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to lease liability recognized in statement of financial position. + References No definition available. + Details
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