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Equity (Preferred Stock) (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
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 $ 11,748,000 $ 11,748,000  
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     $ 3,100,000 $ 3,100,000  
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     $ 4,700,000 4,700,000  
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
Preferred stock dividends declared and paid     $ 4,000,000.0 $ 4,000,000.0