Quarterly report pursuant to Section 13 or 15(d)

EQUITY AND EARNINGS PER SHARE - Schedule of Preferred Shares (Details)

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EQUITY AND EARNINGS PER SHARE - Schedule of Preferred Shares (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 22, 2021
Sep. 14, 2021
Feb. 14, 2020
Feb. 29, 2020
Aug. 31, 2019
Jul. 31, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Class of Stock [Line Items]                      
Number of shares issued (in shares)                 52,210   33,610
Liquidation preference             $ 1,305,250   $ 1,305,250   $ 840,250
Carrying Value(B)             $ 1,262,498   $ 1,262,498    
Dividends (in dollars per share)             $ 1.60 $ 1.32 $ 4.23 $ 3.95  
Liquidation preference per share (in dollars per share)               25.00   25.00  
7.50% Series A Preferred Stock                      
Class of Stock [Line Items]                      
Number of shares issued (in shares)                 6,210   6,210
Liquidation preference             $ 155,250   $ 155,250    
Issuance Discount                 3.15%    
Carrying Value(B)             $ 150,026   $ 150,026    
Dividends (in dollars per share) $ 0.47           $ 0.47 0.47 $ 1.41 1.41  
Interest rate           7.50%          
7.125% Series B Preferred Stock                      
Class of Stock [Line Items]                      
Number of shares issued (in shares)                 11,300   11,300
Liquidation preference             $ 282,500   $ 282,500    
Issuance Discount                 3.15%    
Carrying Value(B)             $ 273,418   $ 273,418    
Dividends (in dollars per share) 0.45           $ 0.45 0.45 $ 1.34 1.34  
Interest rate         7.125%            
6.375% Series C Preferred Stock                      
Class of Stock [Line Items]                      
Number of shares issued (in shares)                 16,100   16,100
Liquidation preference             $ 402,500   $ 402,500    
Issuance Discount                 3.15%    
Carrying Value(B)             $ 389,548   $ 389,548    
Dividends (in dollars per share) 0.40           $ 0.40 0.40 $ 1.20 1.20  
Interest rate     6.375% 6.375%              
Liquidation preference per share (in dollars per share)     $ 25.00                
7.00% Series D Preferred Stock                      
Class of Stock [Line Items]                      
Number of shares issued (in shares)                 18,600   0
Liquidation preference             $ 465,000   $ 465,000    
Issuance Discount                 3.15%    
Carrying Value(B)             $ 449,506   $ 449,506    
Dividends (in dollars per share) $ 0.28           $ 0.28 $ 0 $ 0.28 $ 0  
Interest rate   7.00%                  
Liquidation preference per share (in dollars per share)   $ 25.00