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SHARE CAPITAL AND SHARE BASED COMPENSATION - Share Capital (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2020
Feb. 29, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
SHARE CAPITAL AND SHARE OPTIONS [Abstract]              
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 stock, value, authorized           $ 150,000 $ 150,000
Common shares, shares outstanding (in shares) 109,943,594   109,943,594 101,302,404 101,302,404 109,943,594 101,302,404
Common shares, shares issued (in shares) 109,943,594   109,943,594 101,302,404 101,302,404 109,943,594 101,302,404
Common stock, value, issued           $ 109,944 $ 101,303
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common shares, shares outstanding beginning (in shares)     101,302,404 101,302,404      
Common shares, shares issued beginning (in shares)     101,302,404 101,302,404      
Repurchase and cancellation of treasury shares (in shares)   (1,500,000) (3,500,000) 0      
Issuance of shares (in shares) 12,067,789   12,067,789 0      
Vesting of RSU's (in shares)     73,401 0      
Common shares, shares outstanding end (in shares) 109,943,594   109,943,594 101,302,404 101,302,404    
Common shares, shares issued ending (in shares) 109,943,594   109,943,594 101,302,404 101,302,404    
Consideration for shares repurchased   $ 70,400          
Treasury shares repurchased   3,500,000          
Net proceeds from the issuance of equity $ 100,000   $ 99,831 $ 0 $ 0    
Contributed surplus           $ 200,000 $ 200,000