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DEBT (Restated) - Convertible Bonds Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended
Mar. 31, 2012
Dec. 31, 2015
Dec. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]        
Book value of vessels secured against long-term loans   $ 2,543,012   $ 1,997,657
Declared dividend per share (in dollars per share)   $ 1.40   $ 1.80
Minimum percentage for conversion   90.00%    
Number of shares issuable if bonds are converted   5,456,132    
Convertible bonds | Equity Method Investments        
Debt Instrument [Line Items]        
Book value of vessels secured against long-term loans   $ 13,000    
Convertible debt | Convertible bonds        
Debt Instrument [Line Items]        
Proceeds from issuance of convertible bonds $ 250,000      
Convertible debt 221,900      
Carrying amount of equity component $ 25,000      
Percentage of principal amount convertible 100.00%      
Coupon rate 3.75%      
Debt instrument conversion price (in dollars per share) $ 55 $ 45.82 $ 48.40