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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Shareholders' equity under Luxembourg law) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 01, 2017
Dec. 31, 2014
Disclosure of classes of share capital [line items]          
Legal reserve $ 200,500 $ 200,500 $ 200,500    
Non distributable reserves 1,400,000 1,400,000 1,400,000    
Profit (Loss) for the year 1,022,927 706,929 59,779    
Total Equity 5,852,771 $ 5,166,593 $ 4,802,997   $ 5,634,703
Luxembourg          
Disclosure of classes of share capital [line items]          
Share capital 2,004,743        
Legal reserve 200,474        
Non distributable reserves 1,414,122        
Reserve for own shares 59,600        
Accumulated profit at January 1, 2017       $ 3,135,868  
Profit (Loss) for the year (32,012)        
Total Equity $ 6,782,795