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CONCENTRATION OF RISKS (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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)	1.30%	5.70%	(6.30%)
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member]
Concentration Risk [Line Items]
Concentration risk percentage	34.60%	35.00%	32.70%
Supplier Concentration Risk [Member] | Cost of Goods, Total [Member]
Concentration Risk [Line Items]
Concentration risk percentage	97.00%	90.00%	95.00%

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- Definition

Represents percentage of appreciation and depreciation of the RMB against US dollar.

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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

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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