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Equity (Preferred Stock) (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Jun. 30, 2021
Preferred Stock            
Shares Issued and Outstanding (in shares) 12,200   12,200   12,200  
Preferred stock, liquidation preference (in dollars per share) $ 25.00   $ 25.00   $ 25.00  
Carrying Value $ 282,490,000   $ 282,490,000   $ 282,490,000  
Number of days in year used in the computation of preferred stock dividends for any partial dividend period     360 days      
Number of months used in the computation of preferred stock dividends for any partial dividend period     12 months      
Number of days in month, dividends computation of dividends payable for any partial dividend period     30 days      
Preferred stock dividends declared and paid $ 5,874,000 $ 5,874,000 $ 17,622,000 $ 17,622,000    
Capital gains distribution       100.00%    
Amount of preferred dividends in arrears     $ 0      
Maximum            
Preferred Stock            
Number of days prior to dividend payment date that Board of Directors may elect to designate as the payment date     30 days      
Minimum            
Preferred Stock            
Number of days prior to dividend payment date that Board of Directors may elect to designate as the payment date     10 days      
Series G And I Preferred Stock            
Preferred Stock            
Preferred stock, liquidation preference (in dollars per share) $ 25.00   $ 25.00      
Redemption price as a percentage of liquidation preference     100.00%      
7.65% Series G Cumulative Redeemable Preferred Stock, $0.001 par value            
Preferred Stock            
Shares Issued and Outstanding (in shares) 3,200   3,200   3,200  
Par Value (in dollars per share) $ 0.001   $ 0.001   $ 0.001  
Preferred stock, liquidation preference (in dollars per share) $ 25.00   $ 25.00   $ 25.00  
Rate per Annum     7.65%   7.65%  
Annual Dividend Per Share (in dollars per share)     $ 1.91   $ 1.91  
Carrying Value $ 72,664,000   $ 72,664,000   $ 72,664,000  
Preferred stock dividends declared and paid     $ 4,600,000 $ 4,600,000    
7.50% Series I Cumulative Redeemable Preferred Stock, $0.001 par value            
Preferred Stock            
Shares Issued and Outstanding (in shares) 5,000   5,000   5,000  
Par Value (in dollars per share) $ 0.001   $ 0.001   $ 0.001  
Preferred stock, liquidation preference (in dollars per share) $ 25.00   $ 25.00   $ 25.00  
Rate per Annum     7.50%   7.50%  
Annual Dividend Per Share (in dollars per share)     $ 1.88   $ 1.88  
Carrying Value $ 120,785,000   $ 120,785,000   $ 120,785,000  
Preferred stock dividends declared and paid     $ 7,000,000.0 7,000,000.0    
8.00% Series D Cumulative Redeemable Preferred Stock, $0.001 par value            
Preferred Stock            
Shares Issued and Outstanding (in shares) 4,000   4,000   4,000  
Par Value (in dollars per share) $ 0.001   $ 0.001   $ 0.001  
Preferred stock, liquidation preference (in dollars per share) $ 25.00   $ 25.00   $ 25.00  
Rate per Annum     8.00%   8.00%  
Annual Dividend Per Share (in dollars per share)     $ 2.00   $ 2.00  
Carrying Value $ 89,041,000   $ 89,041,000   $ 89,041,000 $ 89,041,000
Preferred stock dividends declared and paid     $ 6,000,000.0 $ 6,000,000.0