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FAIR VALUE MEASUREMENT - Carrying value (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Impairment charges for property, plant and equipment $ 22,757 $ 6,992 $ 1,573
Carrying value of long-term borrowings 493,455 606,577  
Fair value of long-term borrowings 493,455 606,577  
Carrying value of convertible notes 125,569 146,674  
Idle assets      
Impairment charges for property, plant and equipment $ 22,757 $ 6,992 $ 1,573