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Equity (Preferred Stock) (Details) - USD ($)
 9 Months Ended 12 Months Ended
Oct. 20, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Class of Stock [Line Items]        
Shares Issued and Outstanding (in shares)   16,200,000   25,800,000
Amount of preferred dividends in arrears   $ 0 $ 0  
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%
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   $ 6,000,000 $ 6,000,000  
Series E        
Class of Stock [Line Items]        
Shares Issued and Outstanding (in shares)       5,600,000
Par Value (in dollars per share)       $ 0.001
Liquidation preference (in dollars per share)       $ 25
Rate per Annum       7.875%
Equivalent to Fixed Annual Rate (in dollars per share)       $ 1.97
Dividends declared and paid   8,300,000 8,300,000  
Series F        
Class of Stock [Line Items]        
Shares Issued and Outstanding (in shares)       4,000,000
Par Value (in dollars per share)       $ 0.001
Liquidation preference (in dollars per share)       $ 25
Rate per Annum       7.80%
Equivalent to Fixed Annual Rate (in dollars per share)       $ 1.95
Dividends declared and paid   $ 5,900,000 5,900,000  
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   $ 4,600,000 4,600,000  
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   $ 7,000,000 7,000,000  
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)   $ 50.00   $ 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   $ 6,800,000 $ 6,800,000  
Redemption price as a percentage of liquidation preference       100.00%
Conversion price per share (in dollars per share)   $ 12.79   $ 12.79
Series E and F Preferred Stock        
Class of Stock [Line Items]        
Carrying value of preferred stock   $ 223,700,000    
Preferred stock redemption premium   $ 16,300,000    
Series D, E, F, G and I Preferred Stock        
Class of Stock [Line Items]        
Liquidation preference (in dollars per share)   $ 25   $ 25.00
Subsequent Event | Series E        
Class of Stock [Line Items]        
Preferred stock dividends in arrears (in dollars per share) $ 0.191406      
Subsequent Event | Series F        
Class of Stock [Line Items]        
Liquidation preference (in dollars per share) 25      
Preferred stock dividends in arrears (in dollars per share) 0.189583      
Subsequent Event | Series E and F Preferred Stock        
Class of Stock [Line Items]        
Liquidation preference (in dollars per share) $ 25.00      
Aggregate liquidation preference $ 240,000,000      
Amount of preferred dividends in arrears $ 1,800,000