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CONCENTRATION OF RISKS (Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 16, 2012
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 10.00% |  |  |
Foreign currency exchange rate risk |  |  |  |
Appreciation and depreciation of the RMB against US dollar (as a percent) | 5.70% | 6.30% | 7.20% |
Minimum [Member] |  |  |  |
Foreign currency exchange rate risk |  |  |  |
Daily floating range of RMB trading prices against the U.S. dollar (as a percent) |  |  |  | 0.50%
Maximum [Member] |  |  |  |
Foreign currency exchange rate risk |  |  |  |
Daily floating range of RMB trading prices against the U.S. dollar (as a percent) |  |  |  | 1.00%
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 35.00% | 32.70% | 27.70% |
Supplier Concentration Risk [Member] | Cost of Goods, Total [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 90.00% | 95.00% | 72.00% |

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