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SHAREHOLDERS' EQUITY - Preferred shares (Details) - USD ($)
 2 Months Ended 12 Months Ended
Jan. 17, 2020
Nov. 07, 2016
May 20, 2013
Mar. 19, 2012
Nov. 30, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Apr. 17, 2017
Class of Stock [Line Items]                  
Aggregate cash payment to acquire preferred shares           $ 0 $ 0 $ 351,074,000  
Preferred shares, aggregate liquidation value outstanding           $ 775,000,000 $ 775,000,000    
Series C 6.875% Preferred Shares                  
Class of Stock [Line Items]                  
Preferred shares, aggregate liquidation value issued       $ 400,000,000          
Preferred shares, dividend rate       6.875%          
Preferred shares, par value per share (in usd per share)       $ 0.0125          
Preferred shares, liquidation preference per share (in usd per share)       25.00          
Preferred shares, redemption price per share (in usd per share)       $ 25.00          
Preferred shares, number of shares redeemed (in shares)         1,957,045        
Preferred shares, purchase price per share (in usd per share)         $ 25.67        
Aggregate cash payment to acquire preferred shares         $ 50,000,000        
Loss on repurchase of preferred shares         $ 1,000,000        
Preferred shares, number of shares outstanding (in shares)                 14,042,955
Preferred shares, aggregate liquidation value outstanding                 $ 351,000,000
Series D 5.50% Preferred Shares                  
Class of Stock [Line Items]                  
Preferred shares, aggregate liquidation value issued     $ 225,000,000            
Preferred shares, dividend rate     5.50%            
Preferred shares, par value per share (in usd per share)     $ 0.0125            
Preferred shares, liquidation preference per share (in usd per share)     25.00            
Preferred shares, redemption price per share (in usd per share)     $ 25.00            
Series E 5.50% Preferred Shares                  
Class of Stock [Line Items]                  
Preferred shares, aggregate liquidation value issued   $ 550,000,000              
Preferred shares, dividend rate   5.50%              
Preferred shares, par value per share (in usd per share)   $ 0.0125              
Preferred shares, liquidation preference per share (in usd per share)   2,500              
Preferred shares, redemption price per share (in usd per share)   $ 2,500              
Subsequent event | Series D 5.50% Preferred Shares                  
Class of Stock [Line Items]                  
Preferred shares, number of shares redeemed (in shares) 9,000,000                
Preferred shares, aggregate liquidation value outstanding $ 225,000,000