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LOANS AND BORROWINGS - Long-term borrowings secured (Details) - CNY (¥) ¥ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Long-term borrowings
Assets to secure long-term loans and borrowings	¥ 652,618	¥ 600,734
Long-term loans guaranteed by William Wei Huang, Director and CEO of the Company	¥ 0	9,500
Weighted average interest rates of long-term borrowings	6.99%		8.17%
Accounts receivable
Long-term borrowings
Assets to secure long-term loans and borrowings	¥ 107,819	67,433
Property and equipment, net
Long-term borrowings
Assets to secure long-term loans and borrowings	524,653	512,566
Prepaid land use rights, net
Long-term borrowings
Assets to secure long-term loans and borrowings	¥ 20,146	¥ 20,735

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- Definition

Carrying value as of the balance sheet date of long-term debt guaranteed by related parties.

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- Definition

Amount of assets pledged to secure a long-term debt instrument.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

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