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SHAREHOLDERS' EQUITY (DETAILS 4) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 27, 2016
Jun. 30, 2013
May. 31, 2013
Apr. 30, 2012
Mar. 31, 2012
Nov. 30, 2005
Oct. 31, 2005
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Class of Stock [Line Items]                        
Loss on repurchase of preferred shares                 $ 0 $ 0 $ 3,081  
Preferred shares, aggregate liquidation value outstanding                 627,843 627,843    
Aggregate cash payment to acquire preferred shares                 $ 0 $ 0 $ 100,000  
Series A 7.25% Preferred Shares [Member]                        
Class of Stock [Line Items]                        
Preferred shares, aggregate liquidation value issued             $ 250,000          
Preferred shares, dividend rate   7.25%                    
Preferred shares, aggregate liquidation preference repurchased   $ 100,000     $ 150,000              
Preferred shares, par value per share   $ 0.0125                    
Preferred shares, liquidation preference per share   $ 25.00                    
Preferred shares, dividend declared per share                     $ 0.9063 $ 0.4531
Preferred shares, dividends paid per share                     1.3594  
Preferred shares, number of shares repurchased   4,000,000     6,000,000              
Loss on repurchase of preferred shares   $ 3,000     $ 5,000              
Series B 7.50% Preferred Shares [Member]                        
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                 $ 0.0125      
Preferred shares, liquidation preference per share                 100.00      
Preferred shares, redemption price per share                 100.00      
Preferred shares, dividend declared per share                 6.8125 $ 7.50 7.50  
Preferred shares, dividends paid per share                 $ 7.50 7.50 7.50  
Preferred shares, number of shares repurchased       2,471,570                
Loss on repurchase of preferred shares       $ 9,000                
Preferred shares, number of shares outstanding                 28,430      
Preferred shares, aggregate liquidation value outstanding                 $ 3,000      
Preferred shares, purchase price per share       $ 102.81                
Aggregate cash payment to acquire preferred shares       $ 254,000                
Series B 7.50% Preferred Shares [Member] | Subsequent Event [Member]                        
Class of Stock [Line Items]                        
Preferred shares, aggregate liquidation preference repurchased $ 3,000                      
Preferred shares, number of shares repurchased 28,430                      
Series C 6.875% Preferred Shares [Member]                        
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                 $ 0.0125      
Preferred shares, liquidation preference per share                 25.00      
Preferred shares, redemption price per share                 25.00      
Preferred shares, dividend declared per share                 1.7188 1.7188 1.7188  
Preferred shares, dividends paid per share                 $ 1.7188 1.7188 1.7188  
Series D 5.50% Preferred Shares [Member]                        
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                 $ 0.0125      
Preferred shares, liquidation preference per share                 25.00      
Preferred shares, redemption price per share                 25.00      
Preferred shares, dividend declared per share                 1.3750 1.3750 0.6875  
Preferred shares, dividends paid per share               $ 0.3438 $ 1.3750 $ 1.3750 $ 0.3438