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FAIR VALUE MEASUREMENT (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
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 1,878,900 $ 1,762,200
Fair value measurement at Recurring basis    
FAIR VALUE MEASUREMENT    
Total financial assets 113,210 86,767
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 8,320 10,055
Fair value measurement at Recurring basis | Equity securities (FVOCI)    
FAIR VALUE MEASUREMENT    
Total financial assets 86,252 76,532
Fair value measurement at Recurring basis | Other securities (FVTPL)    
FAIR VALUE MEASUREMENT    
Total financial assets 9,119  
Fair value measurement at Recurring basis | Fair value of derivative financial instruments    
FAIR VALUE MEASUREMENT    
Total financial assets 9,519 180
Fair value measurement at Recurring basis | Level 1    
FAIR VALUE MEASUREMENT    
Total financial assets 79,086 61,245
Fair value measurement at Recurring basis | Level 1 | Equity securities (FVOCI)    
FAIR VALUE MEASUREMENT    
Total financial assets 69,967 61,245
Fair value measurement at Recurring basis | Level 1 | Other securities (FVTPL)    
FAIR VALUE MEASUREMENT    
Total financial assets 9,119  
Fair value measurement at Recurring basis | Level 2    
FAIR VALUE MEASUREMENT    
Total financial assets 34,124 25,522
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 8,320 10,055
Fair value measurement at Recurring basis | Level 2 | Equity securities (FVOCI)    
FAIR VALUE MEASUREMENT    
Total financial assets 16,285 15,287
Fair value measurement at Recurring basis | Level 2 | Fair value of derivative financial instruments    
FAIR VALUE MEASUREMENT    
Total financial assets $ 9,519 $ 180