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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Estimated useful lives (Details)
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12 Months Ended |
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Dec. 31, 2014
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| Buildings | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful life of asset | 10 - 20 years |
| Machinery and equipment | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful life of asset | 6 - 10 years |
| Motor vehicles | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful life of asset | 6 years |
| Furniture, fixtures and office equipment | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful life of asset | 5 years |