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Land Use Rights (Details) - Land use rights - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Land Use Rights      
Cost ¥ 4,402,470 ¥ 3,846,660  
Incentive payment from local government (15,000) (15,000)  
Accumulated amortization (209,213) (124,481)  
Land use right, net 4,178,257 3,707,179  
Total amortization expense ¥ 84,700 ¥ 72,200 ¥ 31,300