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Debt Obligations (Details 4) (USD $)
 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Collateralized loan obligations
Dec. 31, 2013
Collateralized loan obligations
Sep. 30, 2012
CLO I
item
Sep. 30, 2014
CLO I
item
Dec. 31, 2013
CLO I
Jan. 31, 2013
CLO II
item
Sep. 30, 2014
CLO II
item
Dec. 31, 2013
CLO II
Apr. 30, 2014
CLO III
item
Sep. 30, 2014
CLO III
item
Apr. 30, 2014
Class A senior secured floating rate notes
Jan. 31, 2013
Class A senior secured floating rate notes
Sep. 30, 2012
Class A senior secured floating rate notes
Apr. 30, 2014
Class B secured floating rate notes
Jan. 31, 2013
Class B secured floating rate notes
Sep. 30, 2012
Class B secured floating rate notes
Apr. 30, 2014
Class C secured floating rate notes
Debt Obligations                                      
Debt, Face Value     $ 545,750,000 $ 264,500,000   $ 87,500,000 $ 87,500,000 $ 260,000,000 $ 177,000,000 $ 177,000,000 $ 375,000,000 $ 281,250,000 $ 221,300,000 $ 156,000,000 $ 75,000,000 $ 24,300,000 $ 21,000,000 $ 12,500,000 $ 35,800,000
Debt, Carrying Value 371,733,279 639,622,981 545,750,000 264,500,000   87,500,000 87,500,000   177,000,000 177,000,000   281,250,000              
Collateral Loans, Unpaid Principal     662,263,007 369,430,718 125,100,000 96,029,510 114,414,154   225,975,410 255,016,564   340,258,087              
Collateral Loans, Carrying Value     659,632,538 367,930,248   95,787,645 113,940,857 210,000,000 225,266,447 253,989,391 307,300,000 338,578,446              
Collateral Cash, Restricted Cash 143,848,917 54,962,316 97,019,855 15,294,171   29,057,140 10,672,496   33,662,719 4,621,675   34,299,996              
Number of investment grade tranches issued         2 2   2 2   3 3              
Number of newly-formed wholly-owned subsidiaries         2     2     2                
Variable interest rate, description         one-month LIBOR three-month LIBOR   one-month LIBOR three-month LIBOR   one-month LIBOR three-month LIBOR              
Weighted average note rate (as a percent)     2.74% 2.91% 3.39% 3.60%   2.36% 2.55%   2.39% 2.59%              
Replacement period         2 years     2 years     2 years 6 months                
Number of classes of secured floating rate notes         2     2     3                
Notional amount of equity interest retained         37,600,000     83,000,000     93,800,000                
Issuance costs         2,400,000     3,200,000                      
Weighted average note rate including certain fees and costs (as a percent)     3.18% 3.49% 4.35%     3.00%     3.07%                
Proceeds from additional loan obligations               $ 50,000,000     $ 67,700,000                
Period of additional loan obligations               90 days     120 days