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Equity (Preferred Stock) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Class of Stock [Line Items]        
Shares Issued and Outstanding 25,800,000 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
Amount of preferred dividends in arrears   $ 0    
Redemption price as a percentage of liquidation preference   100.00%    
Shares issued upon conversion 3.9087 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 4,000,000 4,000,000   4,000,000
Par Value (in dollars per share) $ 0.001 $ 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
Dividends declared and paid   $ 4,000,000 $ 4,000,000  
Series E        
Class of Stock [Line Items]        
Shares Issued and Outstanding 5,600,000 5,600,000   5,600,000
Par Value (in dollars per share) $ 0.001 $ 0.001   $ 0.001
Liquidation Preference (in dollars per share) $ 25 $ 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   $ 5,500,000 5,500,000  
Series F        
Class of Stock [Line Items]        
Shares Issued and Outstanding 4,000,000 4,000,000   4,000,000
Par Value (in dollars per share) $ 0.001 $ 0.001   $ 0.001
Liquidation Preference (in dollars per share) $ 25 $ 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   $ 3,900,000 3,900,000  
Series G        
Class of Stock [Line Items]        
Shares Issued and Outstanding 3,200,000 3,200,000   3,200,000
Par Value (in dollars per share) $ 0.001 $ 0.001   $ 0.001
Liquidation Preference (in dollars per share) $ 25 $ 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   $ 3,100,000 3,100,000  
Series I        
Class of Stock [Line Items]        
Shares Issued and Outstanding 5,000,000 5,000,000   5,000,000
Par Value (in dollars per share) $ 0.001 $ 0.001   $ 0.001
Liquidation Preference (in dollars per share) $ 25 $ 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   $ 4,700,000 4,700,000  
Series J        
Class of Stock [Line Items]        
Shares Issued and Outstanding 4,000,000 4,000,000   4,000,000
Par Value (in dollars per share) $ 0.001 $ 0.001   $ 0.001
Liquidation Preference (in dollars per share) 50 $ 50   $ 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   $ 4,500,000 $ 4,500,000  
Redemption price as a percentage of liquidation preference       100.00%
Conversion price per share (in dollars per share) 12.79 $ 12.79   $ 12.79
Class D, E, F, G, I [Member]        
Class of Stock [Line Items]        
Liquidation Preference (in dollars per share) $ 25 $ 25