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PROPERTY AND EQUIPMENT, NET - Interest costs (Details) - CNY (¥)
¥ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Interest costs    
Total interest costs ¥ 312,574 ¥ 228,636
Less: interest costs capitalized (38,191) (47,300)
Interest expenses ¥ 274,383 ¥ 181,336