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FAIR VALUE MEASUREMENT (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
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 1,762,200 $ 1,499,400
Fair value measurement at Recurring basis    
FAIR VALUE MEASUREMENT    
Total financial assets 86,767 152,015
Total financial liabilities 8,325  
Fair value measurement at Recurring basis | Fair value of derivative financial instruments    
FAIR VALUE MEASUREMENT    
Total financial liabilities 8,325  
Fair value measurement at Recurring basis | Trade receivables    
FAIR VALUE MEASUREMENT    
Total financial assets 10,055 12,000
Fair value measurement at Recurring basis | Equity securities    
FAIR VALUE MEASUREMENT    
Total financial assets 76,532 122,775
Fair value measurement at Recurring basis | Fair value of derivative financial instruments    
FAIR VALUE MEASUREMENT    
Total financial assets 180 17,240
Fair value measurement at Recurring basis | Level 1    
FAIR VALUE MEASUREMENT    
Total financial assets 61,245 110,664
Fair value measurement at Recurring basis | Level 1 | Equity securities    
FAIR VALUE MEASUREMENT    
Total financial assets 61,245 110,664
Fair value measurement at Recurring basis | Level 2    
FAIR VALUE MEASUREMENT    
Total financial assets 25,522 41,351
Total financial liabilities 8,325  
Fair value measurement at Recurring basis | Level 2 | Fair value of derivative financial instruments    
FAIR VALUE MEASUREMENT    
Total financial liabilities 8,325  
Fair value measurement at Recurring basis | Level 2 | Trade receivables    
FAIR VALUE MEASUREMENT    
Total financial assets 10,055 12,000
Fair value measurement at Recurring basis | Level 2 | Equity securities    
FAIR VALUE MEASUREMENT    
Total financial assets 15,287 12,111
Fair value measurement at Recurring basis | Level 2 | Fair value of derivative financial instruments    
FAIR VALUE MEASUREMENT    
Total financial assets $ 180 $ 17,240