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Equity - Preferred Stock (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Preferred Stock      
Shares Issued and Outstanding (in shares) 16,200,000   16,200,000
Carrying Value $ 476,000,000   $ 476,000,000
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 $ 8,124,000 $ 8,124,000  
Capital gains distribution (as a percent)     100.00%
Unrecaptured Section 1250 gain (s a percent)     26.02%
Long term capital gain (as a percent)     73.98%
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 D      
Preferred Stock      
Shares Issued and Outstanding (in shares) 4,000,000   4,000,000
Par Value (in dollars per share) $ 0.001   $ 0.001
Liquidation Preference (in dollars per share)     $ 25
Rate per Annum 8.00%   8.00%
Equivalent to Fixed Annual Rate (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 2,000,000  
Series G      
Preferred Stock      
Shares Issued and Outstanding (in shares) 3,200,000   3,200,000
Par Value (in dollars per share) $ 0.001   $ 0.001
Liquidation Preference (in dollars per share) $ 25   $ 25
Rate per Annum 7.65%   7.65%
Equivalent to Fixed Annual Rate (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  
Series I      
Preferred Stock      
Shares Issued and Outstanding (in shares) 5,000,000   5,000,000
Par Value (in dollars per share) $ 0.001   $ 0.001
Liquidation Preference (in dollars per share) $ 25   $ 25
Rate per Annum 7.50%   7.50%
Equivalent to Fixed Annual Rate (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  
Series J (convertible)      
Preferred Stock      
Shares Issued and Outstanding (in shares) 4,000,000   4,000,000
Par Value (in dollars per share) $ 0.001   $ 0.001
Liquidation Preference (in dollars per share) $ 50.00   $ 50
Rate per Annum 4.50%   4.50%
Equivalent to Fixed Annual Rate (in dollars per share) $ 2.25   $ 2.25
Carrying Value $ 193,510,000   $ 193,510,000
Preferred stock dividends declared and paid $ 2,300,000 $ 2,300,000  
Redemption price as a percentage of liquidation preference 100.00%    
Shares issued upon conversion (in shares) 4.0149    
Conversion price per share (in dollars per share) $ 12.45    
Series G and Series I      
Preferred Stock      
Liquidation Preference (in dollars per share) $ 25