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SHAREHOLDERS' EQUITY - Preferred shares (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 2 Months Ended 12 Months Ended
Jan. 27, 2016
Jan. 31, 2017
Nov. 30, 2016
May 31, 2013
Apr. 30, 2012
Mar. 31, 2012
Nov. 30, 2005
Feb. 28, 2018
Nov. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Class of Stock [Line Items]                          
Aggregate cash payment to acquire preferred shares                   $ 351,074 $ 51,769 $ 0  
Loss on repurchase of preferred shares                   0 1,309 $ 0  
Preferred shares, aggregate liquidation value outstanding                   $ 775,000 $ 1,126,074    
Series B 7.50% Preferred Shares                          
Class of Stock [Line Items]                          
Preferred shares, aggregate liquidation value issued             $ 250,000            
Preferred shares, dividend rate                   7.50%      
Preferred shares, par value per share (in usd per share)                   $ 0.0125      
Preferred shares, liquidation preference per share (in usd per share)                   100      
Preferred shares, redemption price per share (in usd per share)                   $ 100.00      
Preferred shares, purchase price per share (in usd per share)         $ 102.81                
Preferred shares, number of shares redeemed (in shares) 28,430       2,471,570                
Aggregate cash payment to acquire preferred shares         $ 254,000                
Loss on repurchase of preferred shares         $ 9,000                
Preferred shares, dividend declared per share (in usd per share)                       $ 6.8125 $ 7.50
Preferred shares, dividends paid per share (in usd per share)                       7.50 $ 7.5
Preferred shares, aggregate redemption price $ 3,000                        
Series C 6.875% Preferred Shares                          
Class of Stock [Line Items]                          
Preferred shares, aggregate liquidation value issued           $ 400,000              
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      
Preferred shares, redemption price per share (in usd per share)                   25      
Preferred shares, purchase price per share (in usd per share)     $ 25.67           $ 25.67        
Preferred shares, number of shares redeemed (in shares)                 1,957,045        
Aggregate cash payment to acquire preferred shares                 $ 50,000        
Loss on repurchase of preferred shares                 $ 1,000        
Preferred shares, dividend declared per share (in usd per share)                   0.4297 $ 1.7188 1.7188  
Preferred shares, dividends paid per share (in usd per share)                   $ 0.4297 1.7188 1.7188  
Preferred shares, number of shares outstanding (in shares)     14,042,955           14,042,955        
Preferred shares, aggregate liquidation value outstanding     $ 351,000           $ 351,000        
Series D 5.50% Preferred Shares                          
Class of Stock [Line Items]                          
Preferred shares, aggregate liquidation value issued       $ 225,000                  
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      
Preferred shares, redemption price per share (in usd per share)                   25      
Preferred shares, dividend declared per share (in usd per share)                   1.3750 1.3750 1.3750  
Preferred shares, dividends paid per share (in usd per share)                   1.0313 1.3750 $ 1.3750  
Series E 5.50% Preferred Shares                          
Class of Stock [Line Items]                          
Preferred shares, aggregate liquidation value issued     $ 550,000                    
Preferred shares, dividend rate     5.50%                    
Preferred shares, par value per share (in usd per share)     $ 0.0125           $ 0.0125        
Preferred shares, liquidation preference per share (in usd per share)     $ 2,500           $ 2,500        
Preferred shares, dividend declared per share (in usd per share)                   137.50 $ 34.375    
Preferred shares, dividends paid per share (in usd per share)   $ 34.3750               $ 103.13      
Subsequent Event | Series D 5.50% Preferred Shares                          
Class of Stock [Line Items]                          
Preferred shares, dividends paid per share (in usd per share)               $ 0.34375          
Subsequent Event | Series E 5.50% Preferred Shares                          
Class of Stock [Line Items]                          
Preferred shares, dividend declared per share (in usd per share)               $ 34.375