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SHARE CAPITAL AND SHARE BASED COMPENSATION - Share Capital (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share capital:    
Common stock, value, authorized $ 150,000 $ 150,000
Common stock, value, issued $ 101,303 $ 101,303
Common stock, shares authorized (in shares) 150,000,000 150,000,000
Common shares, par value (in dollars per share) $ 1.00 $ 1.00
Common shares, shares outstanding (in shares) 101,302,404 101,302,404
Common shares, shares issued (in shares) 101,302,404 101,302,404
Contributed surplus $ 200,000 $ 200,000
Stock repurchased during period (in shares) 1,500,000  
Consideration transferred for common stock repurchased $ 69,500  
Remaining amount in share repurchase program (in shares) 2,000,000.0 500,000
Common Stock    
Share capital:    
Shares issued upon exercise of share options (in shares) 0 184,115