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FAIR VALUE MEASUREMENT (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
FAIR VALUE MEASUREMENT    
Transfers of financial assets from level 1 to 2 $ 0  
Transfers of financial assets from level 2 to 1 0  
Transfers of financial assets into 3 0  
Transfers of financial assets from 3 0  
Transfers of financial liabilities from level 1 to 2 0  
Transfers of financial liabilities from level 2 to 1 0  
Transfers of financial liabilities into 3 0  
Transfers of financial liabilities from 3 0  
Long term debt    
FAIR VALUE MEASUREMENT    
Total financial liabilities 1,499,400 $ 1,319,700
Fair value measurement at Recurring basis    
FAIR VALUE MEASUREMENT    
Total financial assets 152,015 100,859
Total financial liabilities   1,120
Fair value measurement at Recurring basis | Fair value of derivative financial instruments    
FAIR VALUE MEASUREMENT    
Total financial liabilities   1,120
Fair value measurement at Recurring basis | Trade receivables    
FAIR VALUE MEASUREMENT    
Total financial assets 12,000 8,185
Fair value measurement at Recurring basis | Availableforsale securities    
FAIR VALUE MEASUREMENT    
Total financial assets 122,775 92,310
Fair value measurement at Recurring basis | Fair value of derivative financial instruments    
FAIR VALUE MEASUREMENT    
Total financial assets 17,240 364
Fair value measurement at Recurring basis | Level 1    
FAIR VALUE MEASUREMENT    
Total financial assets 110,664 86,736
Fair value measurement at Recurring basis | Level 1 | Availableforsale securities    
FAIR VALUE MEASUREMENT    
Total financial assets 110,664 86,736
Fair value measurement at Recurring basis | Level 2    
FAIR VALUE MEASUREMENT    
Total financial assets 41,351 14,123
Total financial liabilities   1,120
Fair value measurement at Recurring basis | Level 2 | Fair value of derivative financial instruments    
FAIR VALUE MEASUREMENT    
Total financial liabilities   1,120
Fair value measurement at Recurring basis | Level 2 | Trade receivables    
FAIR VALUE MEASUREMENT    
Total financial assets 12,000 8,185
Fair value measurement at Recurring basis | Level 2 | Availableforsale securities    
FAIR VALUE MEASUREMENT    
Total financial assets 12,111 5,574
Fair value measurement at Recurring basis | Level 2 | Fair value of derivative financial instruments    
FAIR VALUE MEASUREMENT    
Total financial assets $ 17,240 $ 364