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INVENTORIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
INVENTORIES      
Raw materials $ 97,331 $ 95,224  
Work-in-process 18,904 33,207  
Finished goods 218,254 303,894  
Inventories 334,489 432,325  
Inventory written down $ 23,013 $ 16,951 $ 715