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Debt Obligations - Senior Secured Notes Payable (Details) (USD $)
Sep. 30, 2013
May 31, 2013
Dec. 31, 2012
Jun. 30, 2010
Debt Instrument [Line Items]        
Senior Secured Notes Payable $ 253,543,000   $ 193,320,000  
Senior Secured Notes Payable-Related Party 0   5,000,000  
Total Senior Secured Notes Payable 253,543,000   198,320,000  
Senior Notes [Member]
       
Debt Instrument [Line Items]        
Senior secured notes issued   50,000,000.0   200,000,000.0
Stated interest rate on debt instrument       12.625%
Senior notes issuance price as percent of face amount   111.00%   98.854%
Senior notes issued, effective yield percentage   7.67%   12.875%
Unamortized premium 3,500,000      
Unamortized discount of senior notes     $ 1,700,000