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Equity (Preferred Stock) (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Preferred Stock      
Shares Issued and Outstanding (in shares) 12,200   12,200
Liquidation Preference (in dollars per share) $ 25.00   $ 25.00
Carrying Value $ 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  
Capital gains distribution   100.00%  
Amount of preferred dividends in arrears $ 0    
Liquidation preference (in dollars per share) $ 25.00   $ 25.00
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 D      
Preferred Stock      
Shares Issued and Outstanding (in shares) 4,000   4,000
Par Value (in dollars per share) $ 0.001   $ 0.001
Liquidation Preference (in dollars per share) $ 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
Preferred stock dividends declared and paid $ 2,000,000.0 $ 2,000,000.0  
Liquidation preference (in dollars per share) $ 25.00   $ 25.00
Series G      
Preferred Stock      
Shares Issued and Outstanding (in shares) 3,200   3,200
Par Value (in dollars per share) $ 0.001   $ 0.001
Liquidation Preference (in dollars per share) $ 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
Preferred stock dividends declared and paid $ 1,500,000 1,500,000  
Liquidation preference (in dollars per share) $ 25.00   $ 25.00
Series I      
Preferred Stock      
Shares Issued and Outstanding (in shares) 5,000   5,000
Par Value (in dollars per share) $ 0.001   $ 0.001
Liquidation Preference (in dollars per share) $ 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
Preferred stock dividends declared and paid $ 2,300,000 $ 2,300,000  
Liquidation preference (in dollars per share) $ 25.00   $ 25.00
Series G And I Preferred Stock      
Preferred Stock      
Liquidation Preference (in dollars per share) $ 25.00    
Redemption price as a percentage of liquidation preference 100.00%    
Liquidation preference (in dollars per share) $ 25.00