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PARENT ONLY FINANCIAL INFORMATION - Condensed Statements of Cash Flows (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating activities: |  |  |
Net cash used in operating activities | ¥ 320,887 | ¥ 293,436 | ¥ (12,910)
Investing activities: |  |  |
Net cash used in investing activities | (9,378,007) | (5,131,231) | (4,733,050)
Financing activities: |  |  |
Proceeds from long-term borrowings | 6,939,140 | 5,000,510 | 2,814,197
Payment of issuance cost of borrowings | (112,512) | (156,742) | (91,124)
Payment of commitment cost of borrowings | (45,968) |  |
Repayment of long-term borrowings | (4,187,184) | (1,968,913) | (834,154)
Proceeds from exercise of stock options | 78,748 | 55,469 | 16,866
Net proceeds from issuance of convertible bonds |  |  | 1,867,304
Net proceeds from issuance of ordinary shares | 15,974,517 | 4,934,126 | 1,283,308
Net proceeds from issuance of redeemable preferred shares |  | 989,349 |
Payment of redeemable preferred shares dividends | (65,489) | (25,014) |
Net cash provided by financing activities | 20,143,661 | 8,361,939 | 4,876,806
Effect of exchange rate changes on cash and restricted cash | (566,874) | 164,370 | 206,302
Net increase in cash and restricted cash | 10,519,667 | 3,688,514 | 337,148
Cash and restricted cash at beginning of year | 5,973,262 | 2,284,748 | 1,947,600
Cash and restricted cash at end of year | 16,492,929 | 5,973,262 | 2,284,748
Supplemental disclosures of cash flow information |  |  |
Interest paid | 1,113,443 | 841,388 | 633,063
Supplemental disclosures of non-cash investing and financing activities |  |  |
Settlement of liability-classified restricted share award | 10,089 | 7,984 | 6,357
Conversion of convertible bonds | 65 |  |
Parent Company | Reportable Legal Entities |  |  |
Operating activities: |  |  |
Net cash used in operating activities | (45,269) | (48,514) | (33,729)
Investing activities: |  |  |
Increase of due from subsidiaries | (4,940,005) | (4,473,682) | (3,846,353)
Net cash used in investing activities | (4,940,005) | (4,473,682) | (3,846,353)
Financing activities: |  |  |
Proceeds from long-term borrowings |  | 268,100 | 413,433
Payment of issuance cost of borrowings | (10,619) |  | (25,751)
Payment of commitment cost of borrowings | (45,968) |  |
Repayment of long-term borrowings | (657,820) |  |
Proceeds from exercise of stock options | 78,748 | 55,469 | 16,866
Net proceeds from issuance of convertible bonds |  |  | 1,867,304
Net proceeds from issuance of ordinary shares | 15,974,517 | 4,934,126 | 1,283,308
Net proceeds from issuance of redeemable preferred shares |  | 989,349 |
Payment of redeemable preferred shares dividends | (65,489) | (25,014) |
Net cash provided by financing activities | 15,273,369 | 6,222,030 | 3,555,160
Effect of exchange rate changes on cash and restricted cash | (563,459) | 70,291 | 143,216
Net increase in cash and restricted cash | 9,724,636 | 1,770,125 | (181,706)
Cash and restricted cash at beginning of year | 2,587,613 | 817,488 | 999,194
Cash and restricted cash at end of year | 12,312,249 | 2,587,613 | 817,488
Supplemental disclosures of cash flow information |  |  |
Interest paid | 92,509 | 88,818 | 24,308
Supplemental disclosures of non-cash investing and financing activities |  |  |
Settlement of liability-classified restricted share award | 10,089 | ¥ 7,984 | ¥ 6,357
Conversion of convertible bonds | ¥ 65 |  |

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