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ACCOUNTS RECEIVABLE (Summary of Allowance for Doubtful Accounts) (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Balance at the beginning of the year ¥ 66,857 ¥ 35,347 ¥ 14,041
Additions charged to bad debt expense 33,605 63,103 46,000
Write-off of bad debt allowance 0 (31,593) (24,694)
Balance at the end of the year ¥ 100,462 ¥ 66,857 ¥ 35,347