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SHARE CAPITAL AND SHARE OPTIONS - Share Capital (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended 24 Months Ended
Nov. 30, 2016
Nov. 30, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Share capital:            
Common stock, value, authorized     $ 150,000 $ 150,000   $ 150,000
Common stock, value, issued     $ 101,119 $ 101,081   $ 101,119
Shares issued upon exercise of share options (in shares)     20,000      
Consideration received on sale of subsidiary ownership interest $ 170,000          
Common stock, shares authorized (in shares)     150,000,000 150,000,000   150,000,000
Common shares, par value (in dollars per share)     $ 1.00 $ 1   $ 1.00
Common shares, shares issued (in shares)     101,118,289 101,080,673   101,118,289
Common shares, shares outstanding (in shares)     101,118,289 101,080,673   101,118,289
Percent of stock outstanding   5.00%        
Repurchase period   2 years        
Remaining amount in share repurchase program (in shares)           500,000
Purchase of treasury shares     $ 0 $ 8,214 $ 12,269 $ 20,500
Common Stock            
Share capital:            
Shares issued upon exercise of share options (in shares)     38,000 132,000    
Sale of Stock, Number of Shares Issued in Transaction 7,475,000          
Equity Swap            
Share capital:            
Shares acquired by counterparty (in shares)     3,000,000     3,000,000
Shares acquired by counterparty, per share price (in dollars per share)     $ 43.30     $ 43.30