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Equity (Preferred Stock) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]    
Shares Issued and Outstanding 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 percentage 47.30% 47.30%
Unrecaptured Section 1250 gain percentage 76.15% 76.15%
Long term capital gain percentage 23.85% 23.85%
Ordinary income percentage 52.70% 52.70%
Amount of preferred dividends in arrears $ 0  
Shares issued upon conversion 3.9087  
Redemption price as a percentage of liquidation preference 100.00% 100.00%
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 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
Dividends declared and paid $ 8,000,000 $ 8,000,000
Series E    
Class of Stock [Line Items]    
Shares Issued and Outstanding 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 $ 11,000,000 $ 11,000,000
Series F    
Class of Stock [Line Items]    
Shares Issued and Outstanding 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 $ 7,800,000 $ 7,800,000
Series G    
Class of Stock [Line Items]    
Shares Issued and Outstanding 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 $ 6,100,000 $ 6,100,000
Series I    
Class of Stock [Line Items]    
Shares Issued and Outstanding 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 $ 9,400,000 $ 9,400,000
Series J (convertible)    
Class of Stock [Line Items]    
Shares Issued and Outstanding 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
Dividends declared and paid $ 9,000,000 $ 9,000,000
Conversion price (in dollars per share) $ 12.79 $ 12.79
Redemption price as a percentage of liquidation preference 100.00% 100.00%
Class D, E, F, G, I    
Class of Stock [Line Items]    
Liquidation Preference (in dollars per share) $ 25.00 $ 25.00