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SHARE CAPITAL AND SHARE OPTIONS - Share Capital (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Nov. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share capital:            
Common stock, value, authorized       $ 150,000 $ 150,000  
Common stock, value, issued       $ 93,547 $ 93,415  
Common stock, shares authorized (in shares)       150,000,000 150,000,000  
Common shares, par value (in dollars per share)       $ 1.00 $ 1.00 $ 1.00
Common shares, shares issued (in shares)       93,546,663 93,414,672 80,579,295
Common shares, shares outstanding (in shares)       93,546,663 93,414,672 80,579,295
Shares issued upon exercise of share options (in shares)       132,000 185,000 76,000
Net proceeds for shares issued   $ 660,900   $ 0 $ 660,947 $ 0
Percent of stock outstanding     5.00%      
Repurchase period     2 years      
Remaining amount in share repurchase program (in shares)       300,000    
Purchase of treasury shares       $ 12,269 $ 0 $ 0
Common Stock            
Share capital:            
Common shares, par value (in dollars per share)   $ 1.00        
Shares issued upon exercise of share options (in shares)       100,000 200,000  
Shares issued in offering (in shares)   12,650,000        
Common Stock | Underwriter's Option            
Share capital:            
Shares issued in offering (in shares) 4,173,913 1,650,000        
Common Stock | Secondary Offering [Member]            
Share capital:            
Shares issued in offering (in shares) 32,000,000          
Sale of common units price per share (USD per share) $ 58.50          
World Shipholding            
Share capital:            
Percentage shareholders' ownership before transaction 36.20%     0.00%    
Percentage shareholders' ownership after transaction       1.90%    
Equity Swap            
Share capital:            
Shares acquired by counterparty (in shares)       3,200,000    
Shares acquired by counterparty, per share price (in dollars per share)       $ 41.10