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Debt Obligations (Details 2) (USD $)
 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Collateralized debt obligations
Dec. 31, 2013
Collateralized debt obligations
Dec. 31, 2010
Collateralized debt obligations
Sep. 30, 2014
CDO I debt
item
Dec. 31, 2013
CDO I debt
Sep. 30, 2014
CDO II debt
item
Dec. 31, 2013
CDO II debt
Sep. 30, 2014
CDO III debt
item
Dec. 31, 2013
CDO III debt
Sep. 30, 2014
Revolving note class
Sep. 30, 2014
Revolving note facility
Debt Obligations                          
Debt, Face Value     $ 352,221,414 $ 619,553,858 $ 42,800,000 $ 90,984,854 $ 126,753,077 $ 102,626,199 $ 196,046,587 $ 158,610,361 $ 296,754,194    
Debt, Carrying Value 371,733,279 639,622,981 371,733,279 639,622,981   96,469,891 132,399,560 108,260,762 201,847,417 167,002,626 305,376,004 167,000,000  
Collateral Loans, Unpaid Principal     768,091,268 1,042,692,660   234,132,391 284,758,473 264,844,518 362,150,693 269,114,359 395,783,494    
Collateral Loans, Carrying Value     637,927,308 915,290,998   185,525,965 237,194,618 214,562,939 312,859,875 237,838,404 365,236,505    
Collateral Cash, Restricted Cash 143,848,917 54,962,316 29,995,822 25,407,559   14,996,753 79,986 2,865,954 1,719,760 12,133,115 23,607,813    
Collateral-At-Risk     468,290,970 607,184,618   191,226,061 179,466,954 120,282,351 187,213,841 156,782,558 240,503,823    
Number of investment grade tranches issued           4   9   10      
Variable interest rate, description           three-month LIBOR   three-month LIBOR   three-month LIBOR      
Weighted average note rate (as a percent)     2.83% 2.18%   2.64%   5.96%   0.92%      
Weighted average note rate excluding the swap effect (as a percent)     1.00% 0.83%                  
Weighted average note rate including certain fees and costs (as a percent)     4.73% 3.26%                  
Revolving note amount                       $ 100,000,000 $ 17,500,000