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Equity - Preferred Stock (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 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    
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    
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 $ 11,748,000 $ 16,248,000  
Capital gains distribution (as a percent)         100.00%  
Unrecaptured Section 1250 gain (s 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         4.125
Carrying value prior to redemption $ 193,500,000         $ 193,500,000
Liquidation preference (in dollars per share) $ 50.00         $ 50.00
Preferred Stock            
Liquidation Preference (in dollars per share) $ 50.00         $ 50.00
Carrying Value $ 193,500,000         $ 193,500,000
Preferred stock dividends declared and paid         $ 4,500,000  
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       4,000,000.0 4,000,000.0  
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       $ 3,100,000 3,100,000  
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       $ 4,700,000 $ 4,700,000  
Redemption price as a percentage of liquidation preference       100.00%