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SHAREHOLDERS' EQUITY - Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jan. 17, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]        
Common shares, dividends declared per share (in usd per share)   $ 1.65 $ 1.61 $ 1.57
Common shares, dividends paid per share (in usd per share)   1.23 1.20 1.17
Dividends paid in year following declaration (in usd per share)   $ 0.42 $ 0.41 0.40
Preferred shares   $ 550,000 $ 775,000  
Series D preferred shares        
Class of Stock [Line Items]        
Preferred shares, dividend declared per share (in usd per share)     $ 1.21 1.38
Preferred shares, dividends paid per share (in usd per share)     1.03 1.03
Dividends paid in year following declaration (in usd per share)     0.18 0.34
Preferred shares, number of shares redeemed (in shares) 9,000,000      
Preferred shares $ 225,000      
Series E preferred shares        
Class of Stock [Line Items]        
Preferred shares, dividend declared per share (in usd per share)   $ 137.50 137.50 137.50
Preferred shares, dividends paid per share (in usd per share)   103.13 103.13 103.13
Dividends paid in year following declaration (in usd per share)   $ 34.38 $ 34.38 $ 34.38