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PARENT ONLY FINANCIAL INFORMATION - Condensed Statements of Operations (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Statements of Operations      
Net revenue ¥ 5,738,972 ¥ 4,122,405 ¥ 2,792,077
Cost of revenue (4,188,521) (3,079,679) (2,169,636)
Gross loss 1,550,451 1,042,726 622,441
Operating expenses      
Selling and marketing expenses (134,937) (129,901) (110,570)
General and administrative expenses (702,524) (411,418) (329,601)
Research and development expenses (40,049) (21,627) (13,915)
Income from operations 672,941 479,780 168,355
Other income (expenses):      
Interest income 29,011 53,017 19,213
Interest expenses (1,316,506) (968,693) (656,186)
Others, net 4,952 5,565 5,436
Loss before income taxes (548,436) (426,433) (439,659)
Income tax expenses (120,778) (15,650) 9,391
Net loss (669,214) (442,083) (430,268)
Parent Company | Reportable Legal Entities      
Condensed Statements of Operations      
Cost of revenue (94,312) (50,201) (21,132)
Gross loss (94,312) (50,201) (21,132)
Operating expenses      
Selling and marketing expenses (58,649) (40,721) (26,595)
General and administrative expenses (224,934) (153,854) (96,581)
Research and development expenses (4,596) (2,364) (949)
Income from operations (382,491) (247,140) (145,257)
Other income (expenses):      
Interest income 18,641 48,020 14,907
Interest expenses (155,605) (128,539) (48,809)
Equity in loss of subsidiaries (144,153) (114,418) (251,085)
Others, net (2,799) (6) (24)
Loss before income taxes (666,407) (442,083) (430,268)
Net loss ¥ (666,407) ¥ (442,083) ¥ (430,268)