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Equity - Preferred Stock (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 01, 2019
Class of Stock [Line Items]              
Carrying value prior to redemption $ 282,490,000 $ 282,490,000   $ 282,490,000   $ 282,490,000  
Liquidation preference (in dollars per share) $ 25.00 $ 25.00   $ 25.00   $ 25.00  
Preferred Stock              
Shares Issued and Outstanding (in shares) 12,200,000 12,200,000   12,200,000   12,200,000  
Liquidation Preference (in dollars per share) $ 25.00 $ 25.00   $ 25.00   $ 25.00  
Carrying Value $ 282,490,000 $ 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   360 days  
Number of months used in the computation of preferred stock dividends for any partial dividend period       12 months   12 months  
Number of days in month, dividends computation of dividends payable for any partial dividend period       30 days   30 days  
Preferred stock dividends declared and paid   5,874,000 $ 8,124,000 $ 17,622,000 $ 24,372,000    
Capital gains distribution (as a percent)         100.00%    
Unrecaptured Section 1250 gain (as a percent)         34.01%    
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   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   10 days  
Series J (convertible)              
Class of Stock [Line Items]              
Shares issued upon conversion (in shares) 16,500,000            
Conversion rate (in shares)             4.125
Carrying value prior to redemption             $ 193,500,000
Liquidation preference (in dollars per share)             $ 50.00
Preferred Stock              
Liquidation Preference (in dollars per share)             $ 50.00
Carrying Value             $ 193,500,000
Preferred stock dividends declared and paid         $ 6,800,000    
Series D              
Class of Stock [Line Items]              
Carrying value prior to redemption $ 89,041,000 $ 89,041,000   $ 89,041,000   $ 89,041,000  
Liquidation preference (in dollars per share) $ 25.00 $ 25.00   $ 25.00   $ 25.00  
Preferred Stock              
Shares Issued and Outstanding (in shares) 4,000,000 4,000,000   4,000,000   4,000,000  
Par Value (in dollars per share) $ 0.001 $ 0.001   $ 0.001   $ 0.001  
Liquidation Preference (in dollars per share) $ 25.00 $ 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    
Series G              
Class of Stock [Line Items]              
Carrying value prior to redemption $ 72,664,000 $ 72,664,000   $ 72,664,000   $ 72,664,000  
Liquidation preference (in dollars per share) $ 25.00 $ 25.00   $ 25.00   $ 25.00  
Preferred Stock              
Shares Issued and Outstanding (in shares) 3,200,000 3,200,000   3,200,000   3,200,000  
Par Value (in dollars per share) $ 0.001 $ 0.001   $ 0.001   $ 0.001  
Liquidation Preference (in dollars per share) $ 25.00 $ 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   $ 72,664,000  
Preferred stock dividends declared and paid       $ 4,600,000 4,600,000    
Redemption price as a percentage of liquidation preference       100.00%      
Series I              
Class of Stock [Line Items]              
Carrying value prior to redemption $ 120,785,000 $ 120,785,000   $ 120,785,000   $ 120,785,000  
Liquidation preference (in dollars per share) $ 25.00 $ 25.00   $ 25.00   $ 25.00  
Preferred Stock              
Shares Issued and Outstanding (in shares) 5,000,000 5,000,000   5,000,000   5,000,000  
Par Value (in dollars per share) $ 0.001 $ 0.001   $ 0.001   $ 0.001  
Liquidation Preference (in dollars per share) $ 25.00 $ 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   $ 120,785,000  
Preferred stock dividends declared and paid       $ 7,000,000.0 $ 7,000,000.0    
Redemption price as a percentage of liquidation preference       100.00%