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Debt Obligations, Collateralized Loan Obligations (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2017 USD ($) subsidiary tranche | Apr. 30, 2017 USD ($) subsidiary tranche | Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Obligations |  |  |  |  |
Debt, Carrying Value |  |  | $ 1,066,230,488 | $ 1,066,230,488 | $ 728,441,109
Weighted average note rate (as a percent) |  |  | 2.99% | 2.99% | 2.25%
Outstanding notes repaid |  |  |  | $ 219,000,000 |
CLOs |  |  |  |  |
Debt Obligations |  |  |  |  |
Debt, Carrying Value |  |  | $ 1,066,230,488 | 1,066,230,488 | $ 728,441,109
Debt, Face Value |  |  | $ 1,079,874,000 | $ 1,079,874,000 | $ 737,000,000
Weighted average note rate (as a percent) |  |  | 3.32% | 3.32% | 3.21%
Collateral Loans, Unpaid Principal |  |  | $ 1,254,803,220 | $ 1,254,803,220 | $ 960,567,514
Collateral Loans, Carrying Value |  |  | 1,249,875,599 | 1,249,875,599 | 957,527,517
Cash collateral |  |  | 134,196,781 | 134,196,781 | 14,432,488
Deferred financing fees |  |  | 13,600,000 | 13,600,000 | 8,600,000
Collateral at risk |  |  | $ 0 | $ 0 | $ 0
Weighted average note rate including certain fees and costs (as a percent) |  |  | 3.88% | 3.88% | 3.71%
CLO VIII |  |  |  |  |
Debt Obligations |  |  |  |  |
Number of investment grade tranches issued | tranche | 6 |  |  |  |
Number of newly-formed wholly-owned subsidiaries | subsidiary | 2 |  |  |  |
Debt, Carrying Value | $ 312,100,000 |  | $ 278,296,193 | $ 278,296,193 |
Debt, Face Value | 365,000,000 |  | $ 282,874,000 | $ 282,874,000 |
Value of portfolio loans as collateral | $ 293,700,000 |  |  |  |
Weighted average note rate (as a percent) |  |  | 2.58% | 2.58% |
Collateral Loans, Unpaid Principal |  |  | $ 324,190,963 | $ 324,190,963 |
Collateral Loans, Carrying Value |  |  | 322,527,190 | 322,527,190 |
Cash collateral |  |  | 40,809,037 | 40,809,037 |
Replacement period | 3 years |  |  |  |
Proceeds from issuance of securities for the purpose of acquiring additional loan obligations | $ 71,300,000 |  |  |  |
Notional amount of residual interest retained | $ 82,100,000 |  |  |  |
CLO VIII | One-month LIBOR |  |  |  |  |
Debt Obligations |  |  |  |  |
Weighted average note rate (as a percent) | 1.31% |  |  |  |
CLO VIII | Investment grade |  |  |  |  |
Debt Obligations |  |  |  |  |
Debt, Carrying Value | $ 282,900,000 |  |  |  |
CLO VIII | Below investment grade |  |  |  |  |
Debt Obligations |  |  |  |  |
Debt, Carrying Value | $ 29,200,000 |  |  |  |
CLO VII |  |  |  |  |
Debt Obligations |  |  |  |  |
Number of newly-formed wholly-owned subsidiaries | subsidiary |  | 2 |  |  |
Debt, Carrying Value |  | $ 279,000,000 | 275,035,774 | 275,035,774 |
Debt, Face Value |  | $ 360,000,000 | $ 279,000,000 | $ 279,000,000 |
Weighted average note rate (as a percent) |  | 1.99% | 3.27% | 3.27% |
Collateral Loans, Unpaid Principal |  |  | $ 313,857,643 | $ 313,857,643 |
Collateral Loans, Carrying Value |  |  | 312,693,431 | 312,693,431 |
Cash collateral |  |  | 35,142,358 | 35,142,358 |
Replacement period |  | 3 years |  |  |
Proceeds from issuance of securities for the purpose of acquiring additional loan obligations |  | $ 63,800,000 |  |  |
Maximum period to acquire additional loan obligations |  | 120 days |  |  |
Notional amount of residual interest retained |  | $ 81,000,000 |  |  |
CLO VII | Investment grade |  |  |  |  |
Debt Obligations |  |  |  |  |
Number of investment grade tranches issued | tranche |  | 3 |  |  |
CLO VII | Secured Debt |  |  |  |  |
Debt Obligations |  |  |  |  |
Value of portfolio loans as collateral |  | $ 296,200,000 |  |  |
CLO VI |  |  |  |  |
Debt Obligations |  |  |  |  |
Debt, Carrying Value |  |  | 247,207,545 | 247,207,545 | $ 246,442,883
Debt, Face Value |  |  | $ 250,250,000 | $ 250,250,000 | $ 250,250,000
Weighted average note rate (as a percent) |  |  | 3.76% | 3.76% | 3.30%
Collateral Loans, Unpaid Principal |  |  | $ 303,821,532 | $ 303,821,532 | $ 324,569,105
Collateral Loans, Carrying Value |  |  | 302,750,497 | 302,750,497 | 323,350,928
Cash collateral |  |  | 21,178,468 | 21,178,468 | 430,895
CLO V |  |  |  |  |
Debt Obligations |  |  |  |  |
Debt, Carrying Value |  |  | 265,690,976 | 265,690,976 | 264,864,114
Debt, Face Value |  |  | $ 267,750,000 | $ 267,750,000 | $ 267,750,000
Weighted average note rate (as a percent) |  |  | 3.72% | 3.72% | 3.26%
Collateral Loans, Unpaid Principal |  |  | $ 312,933,082 | $ 312,933,082 | $ 344,679,286
Collateral Loans, Carrying Value |  |  | 311,904,481 | 311,904,481 | 343,747,570
Cash collateral |  |  | 37,066,918 | 37,066,918 | 5,320,715
CLO IV |  |  |  |  |
Debt Obligations |  |  |  |  |
Debt, Carrying Value |  |  |  |  | 217,134,112
Debt, Face Value |  |  |  |  | $ 219,000,000
Weighted average note rate (as a percent) |  |  |  |  | 3.06%
Collateral Loans, Unpaid Principal |  |  |  |  | $ 291,319,123
Collateral Loans, Carrying Value |  |  |  |  | 290,429,019
Cash collateral |  |  |  |  | $ 8,680,878
Outstanding notes repaid |  |  | 219,000,000 |  |
CLO IV | Interest expense |  |  |  |  |
Debt Obligations |  |  |  |  |
Deferred financing fees |  |  | $ 1,100,000 | $ 1,100,000 |

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