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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 |  |  |  |  |  |  |
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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 |  |  |  |  |  |  |  |

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- Definition Represents the replacement period of financing that allows the principal proceeds and sale proceeds (if any) of the loan obligations to be reinvested in qualifying replacement loan obligations. + References No definition available. + Details
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- Definition Represents the number of investment grade tranches issued by the entity under collateralized debt obligations. + References No definition available. + Details
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- Definition Represents the carrying value of the mortgage loans that serve as collateral. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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