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Equity (Preferred Stock) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Class of Stock [Line Items]      
Shares Issued and Outstanding (in shares) 25,800,000   25,800,000
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)     47.30%
Unrecaptured Section 1250 gain (s a percent)     76.15%
Long term capital gain (as a percent)     23.85%
Ordinary income (as a percent)     52.70%
Amount of preferred dividends in arrears $ 0 $ 0  
Redemption price as a percentage of liquidation preference 100.00% 100.00%  
Shares issued upon conversion 3.9087   3.9087
Maximum      
Class of Stock [Line Items]      
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      
Class of Stock [Line Items]      
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      
Class of Stock [Line Items]      
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) $ 25.00 $ 25.00 $ 25
Rate per Annum 8.00%   8.00%
Equivalent to Fixed Annual Rate (in dollars per share) $ 2.00   $ 2.00
Dividends declared and paid $ 2,000,000 $ 2,000,000  
Series E      
Class of Stock [Line Items]      
Shares Issued and Outstanding (in shares) 5,600,000   5,600,000
Par Value (in dollars per share) $ 0.001   $ 0.001
Liquidation preference (in dollars per share) $ 25   $ 25
Rate per Annum 7.875%   7.875%
Equivalent to Fixed Annual Rate (in dollars per share) $ 1.97   $ 1.97
Dividends declared and paid $ 2,800,000 2,800,000  
Series F      
Class of Stock [Line Items]      
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 7.80%   7.80%
Equivalent to Fixed Annual Rate (in dollars per share) $ 1.95   $ 1.95
Dividends declared and paid $ 2,000,000 2,000,000  
Series G      
Class of Stock [Line Items]      
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
Dividends declared and paid $ 1,500,000 1,500,000  
Series I      
Class of Stock [Line Items]      
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
Dividends declared and paid $ 2,300,000 2,300,000  
Series J      
Class of Stock [Line Items]      
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   $ 50.00
Rate per Annum 4.50%   4.50%
Equivalent to Fixed Annual Rate (in dollars per share) $ 2.25   $ 2.25
Dividends declared and paid $ 2,300,000 $ 2,300,000  
Redemption price as a percentage of liquidation preference     100.00%
Conversion price per share (in dollars per share) $ 12.79   $ 12.79