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Equity (Preferred Stock) (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Preferred Stock      
Shares Issued and Outstanding (in shares) 16,200,000   16,200,000
Carrying value of preferred stock $ 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
Capital gains distribution (as a percent)     100.00%
Unrecaptured Section 1250 gain (s a percent)     27.90%
Long term capital gain (as a percent)     72.10%
Amount of preferred dividends in arrears $ 0    
Shares issued upon conversion 3.9087    
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   $ 25
Rate per Annum 8.00%   8.00%
Equivalent to Fixed Annual Rate (in dollars per share) $ 2.00   $ 2.00
Carrying value of preferred stock $ 89,041,000   $ 89,041,000
Dividends declared and paid $ 4,000,000 $ 4,000,000  
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 of preferred stock $ 72,664,000   $ 72,664,000
Dividends declared and paid $ 3,100,000 3,100,000  
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 of preferred stock $ 120,785,000   $ 120,785,000
Dividends declared and paid $ 4,700,000 4,700,000  
Series J      
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 of preferred stock $ 193,510,000   $ 193,510,000
Dividends declared and paid $ 4,500,000 4,500,000  
Conversion price per share (in dollars per share) $ 12.79    
Series E      
Preferred Stock      
Dividends declared and paid   5,500,000  
Series F      
Preferred Stock      
Dividends declared and paid   $ 3,900,000  
Series G and Series I      
Preferred Stock      
Redemption price as a percentage of liquidation preference 100.00%