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Debt Obligations (Details 4) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Jun. 30, 2015
Dec. 31, 2010
Jul. 31, 2015
Jan. 31, 2015
Dec. 31, 2014
Debt Obligations              
Gain on Acceleration of Deferred Income     $ 11,009,162        
Loss on termination of swaps     $ 4,289,450        
Collateralized debt obligations              
Debt Obligations              
Debt instrument redemption value           $ 167,900,000  
Gain   $ 8,200,000          
Face amount of debt instrument re-issued       $ 42,800,000     $ 312,071,055
Additional debt       65,200,000      
Portion of the entity's bonds that were exchanged       42,300,000      
Estimated interest due on reissued bonds   11,000,000   22,900,000      
Collateralized debt obligations | Forecast              
Debt Obligations              
Gain on Acceleration of Deferred Income $ 8,200,000            
Other costs related to the unwind of CDO $ (500,000)            
$150 million warehouse repurchase facility              
Debt Obligations              
Committed line           $ 150,000,000  
Cash equity generated   30,000,000          
Deferred fees expensed as interest expense   500,000          
Loss on terminated derivative   $ 4,300,000          
Junior subordinated notes              
Debt Obligations              
Amount of retired debt instrument       $ 114,100,000      
Subsequent event | Collateralized debt obligations              
Debt Obligations              
Debt instrument redemption value         $ 71,100,000