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FAIR VALUE MEASUREMENT - Fair value of derivative instruments on the consolidated balance sheets (Details) - Not designated as hedging instruments - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Effect of fair value of derivative instruments on the consolidated balance sheets    
Total derivatives asset $ 27,716 $ 8,331
Total derivatives liability 9,625 52,586
Derivative assets - current | Foreign exchange forward contracts    
Effect of fair value of derivative instruments on the consolidated balance sheets    
Total derivatives asset 10,632 1,924
Derivative assets - current | Interest rate swaption    
Effect of fair value of derivative instruments on the consolidated balance sheets    
Total derivatives asset   4,335
Derivative assets - current | Commodity hedge    
Effect of fair value of derivative instruments on the consolidated balance sheets    
Total derivatives asset 1,638  
Derivative assets - non-current | Commodity hedge    
Effect of fair value of derivative instruments on the consolidated balance sheets    
Total derivatives asset 2,592 2,072
Derivative assets - non-current | Interest rate swap    
Effect of fair value of derivative instruments on the consolidated balance sheets    
Total derivatives asset 12,854  
Derivative liabilities - current | Foreign exchange forward contracts    
Effect of fair value of derivative instruments on the consolidated balance sheets    
Total derivatives liability 3,496 5,775
Derivative liabilities - current | Warrants    
Effect of fair value of derivative instruments on the consolidated balance sheets    
Total derivatives liability 711 25,265
Derivative liabilities - current | Interest rate swap    
Effect of fair value of derivative instruments on the consolidated balance sheets    
Total derivatives liability $ 5,418 4,188
Derivative liabilities - non-current | Interest rate swap    
Effect of fair value of derivative instruments on the consolidated balance sheets    
Total derivatives liability   $ 17,358