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Debt Obligations (Details 3) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Dec. 31, 2010
Junior subordinated notes
Dec. 31, 2009
Junior subordinated notes
Sep. 30, 2014
Collateralized debt obligations
Dec. 31, 2010
Collateralized debt obligations
Dec. 31, 2013
Collateralized debt obligations
Sep. 30, 2013
Class H
Sep. 30, 2013
Class H
Debt Obligations                  
Face Amount               $ 2,800,000 $ 9,900,000
Amount of debt instrument purchased from third party investor               1,700,000 5,000,000
Gain 1,167,772 4,930,772           1,200,000 4,900,000
Face amount of debt instrument re-issued       289,400,000 352,221,414 42,800,000 619,553,858    
Amount of retired debt instrument     114,100,000 258,400,000          
Additional debt           65,200,000      
Portion of the entity's bonds that were exchanged           42,300,000      
Estimated interest due on reissued bonds         $ 19,500,000 $ 22,900,000