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SHARE CAPITAL AND SHARE OPTIONS - Share Capital (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Nov. 18, 2016
Nov. 30, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share capital:          
Common stock, value, authorized     $ 150,000 $ 150,000  
Common stock, value, issued     $ 101,081 $ 93,547  
Shares issued upon exercise of share options (in shares)     77,000    
Common stock, shares authorized (in shares)     150,000,000 150,000,000  
Common shares, par value (in dollars per share)     $ 1 $ 1.00  
Common shares, shares issued (in shares)     101,080,673 93,546,663  
Common shares, shares outstanding (in shares)     101,080,673 93,546,663  
Net proceeds for shares issued $ 170,000   $ 169,876 $ 0 $ 660,947
Percent of stock outstanding   5.00%      
Repurchase period   2 years      
Remaining amount in share repurchase program (in shares)     300,000 300,000  
Purchase of treasury shares     $ 8,214 $ 12,269 $ 0
Common Stock          
Share capital:          
Shares issued upon exercise of share options (in shares)     100,000 100,000  
Common Stock | Public Stock Offering [Member]          
Share capital:          
Shares issued in offering (in shares) 7,475,000        
Common Stock Including Additional Paid in Capital [Member] | Common Stock Including Additional Paid in Capital [Member]          
Share capital:          
Common shares, par value (in dollars per share)     $ 1.00    
Equity Swap          
Share capital:          
Shares acquired by counterparty (in shares)     3,000,000    
Shares acquired by counterparty, per share price (in dollars per share)     $ 42.03