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Debt Obligations, Collateralized Loan Obligations (Details) | 1 Months Ended | 12 Months Ended
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Nov. 30, 2019 USD ($) tranche item | Jun. 30, 2019 USD ($) tranche item | Jun. 30, 2018 USD ($) tranche item | Dec. 31, 2017 USD ($) tranche item | Sep. 30, 2017 USD ($) | Aug. 31, 2017 USD ($) tranche item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Obligations |  |  |  |  |  |  |  |  |
Proceeds from issuance of collateralized loan obligations |  |  |  |  |  |  | $ 1,067,193,000 | $ 441,000,000 | $ 918,274,000
Debt, Carrying Value |  |  |  |  |  |  | $ 2,130,121,000 | $ 1,593,548,000 |
Weighted average note rate (as a percent) |  |  |  |  |  |  | 3.54% | 4.35% |
Payoffs and paydowns of collateralized loan obligations |  |  |  |  |  |  | $ 529,250,000 | $ 267,750,000 | 219,000,000
CLOs |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Debt, Face Value |  |  |  |  |  |  | 2,147,467,000 | 1,609,524,000 |
Debt, Carrying Value |  |  |  |  |  |  | $ 2,130,121,000 | $ 1,593,548,000 |
Weighted average note rate (as a percent) |  |  |  |  |  |  | 3.23% | 4.22% |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  | $ 2,497,578,000 | $ 1,939,031,000 |
Collateral Loans, Carrying Value |  |  |  |  |  |  | 2,487,391,000 | 1,932,693,000 |
Cash, Restricted Cash |  |  |  |  |  |  | 118,411,000 | 123,503,000 |
Deferred financing fees |  |  |  |  |  |  | $ 17,300,000 | $ 16,000,000 |
Weighted average note rate including certain fees and costs (as a percent) |  |  |  |  |  |  | 3.63% | 4.73% |
Collateral at risk |  |  |  |  |  |  | $ 0 | $ 0 |
CLO XII |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Number of tranches of CLO notes issued | tranche | 8 |  |  |  |  |  |  |  |
Number of newly-formed wholly-owned subsidiaries | item | 2 |  |  |  |  |  |  |  |
Proceeds from issuance of collateralized loan obligations | $ 124,100,000 |  |  |  |  |  |  |  |
Debt, Face Value | 635,000,000 |  |  |  |  |  | 534,193,000 |  |
Debt, Carrying Value | $ 585,800,000 |  |  |  |  |  | $ 529,448,000 |  |
Weighted average note rate (as a percent) |  |  |  |  |  |  | 3.30% |  |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  | $ 596,366,000 |  |
Collateral Loans, Carrying Value |  |  |  |  |  |  | 593,652,000 |  |
Cash, Restricted Cash |  |  |  |  |  |  | 17,800,000 |  |
Replacement period | 3 years |  |  |  |  |  |  |  |
Maximum period to acquire additional loan obligations | 180 days |  |  |  |  |  |  |  |
Notional amount of residual interest retained | $ 100,800,000 |  |  |  |  |  |  |  |
Value of portfolio loans as collateral | $ 510,900,000 |  |  |  |  |  |  |  |
Leverage (as a percent) | 84.00% |  |  |  |  |  |  |  |
CLO XII | Investment grade |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Debt, Carrying Value | $ 534,200,000 |  |  |  |  |  |  |  |
CLO XII | Below investment grade |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Debt, Carrying Value | $ 51,600,000 |  |  |  |  |  |  |  |
CLO XII | Secured Debt | One-month LIBOR |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Weighted average note rate (as a percent) | 1.50% |  |  |  |  |  |  |  |
CLO XI |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Number of tranches of CLO notes issued | tranche |  | 8 |  |  |  |  |  |  |
Number of newly-formed wholly-owned subsidiaries | item |  | 2 |  |  |  |  |  |  |
Debt, Face Value |  | $ 650,000,000 |  |  |  |  | 533,000,000 |  |
Debt, Carrying Value |  | $ 602,100,000 |  |  |  |  | $ 528,690,000 |  |
Weighted average note rate (as a percent) |  |  |  |  |  |  | 3.25% |  |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  | $ 624,443,000 |  |
Collateral Loans, Carrying Value |  |  |  |  |  |  | 621,508,000 |  |
Cash, Restricted Cash |  |  |  |  |  |  | 15,550,000 |  |
Replacement period |  | 3 years |  |  |  |  |  |  |
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations |  | $ 129,600,000 |  |  |  |  |  |  |
Maximum period to acquire additional loan obligations |  | 120 days |  |  |  |  |  |  |
Notional amount of residual interest retained |  | $ 117,000,000 |  |  |  |  |  |  |
Value of portfolio loans as collateral |  | $ 520,400,000 |  |  |  |  |  |  |
Leverage (as a percent) |  | 82.00% |  |  |  |  |  |  |
CLO XI | Investment grade |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Debt, Carrying Value |  | $ 533,000,000 |  |  |  |  |  |  |
CLO XI | Below investment grade |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Debt, Carrying Value |  | $ 69,100,000 |  |  |  |  |  |  |
CLO XI | Secured Debt | One-month LIBOR |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Weighted average note rate (as a percent) |  | 1.44% |  |  |  |  |  |  |
CLO X |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Number of tranches of CLO notes issued | tranche |  |  | 7 |  |  |  |  |  |
Number of newly-formed wholly-owned subsidiaries | item |  |  | 2 |  |  |  |  |  |
Debt, Face Value |  |  | $ 560,000,000 |  |  |  | 441,000,000 | 441,000,000 |
Debt, Carrying Value |  |  | $ 494,200,000 |  |  |  | $ 437,391,000 | $ 436,384,000 |
Weighted average note rate (as a percent) |  |  |  |  |  |  | 3.26% | 4.01% |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  | $ 509,887,000 | $ 539,007,000 |
Collateral Loans, Carrying Value |  |  |  |  |  |  | 507,854,000 | 536,869,000 |
Cash, Restricted Cash |  |  |  |  |  |  | 37,287,000 | 20,993,000 |
Replacement period |  |  | 4 years |  |  |  |  |  |
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations |  |  | $ 58,100,000 |  |  |  |  |  |
Maximum period to acquire additional loan obligations |  |  | 120 days |  |  |  |  |  |
Notional amount of secured floating rate notes |  |  | $ 119,000,000 |  |  |  |  |  |
Value of portfolio loans as collateral |  |  | $ 501,900,000 |  |  |  |  |  |
Leverage (as a percent) |  |  | 79.00% |  |  |  |  |  |
CLO X | Investment grade |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Debt, Carrying Value |  |  | $ 441,000,000 |  |  |  |  |  |
CLO X | Below investment grade |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Debt, Carrying Value |  |  | 53,200,000 |  |  |  |  |  |
Notional amount of secured floating rate notes |  |  | $ 53,200,000 |  |  |  |  |  |
CLO X | Secured Debt | One-month LIBOR |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Weighted average note rate including certain fees and costs (as a percent) |  |  | 1.45% |  |  |  |  |  |
CLO IX |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Number of tranches of CLO notes issued | tranche |  |  |  | 5 |  |  |  |  |
Number of newly-formed wholly-owned subsidiaries | item |  |  |  | 2 |  |  |  |  |
Debt, Face Value |  |  |  | $ 480,000,000 |  |  | 356,400,000 | 356,400,000 | 480,000,000
Debt, Carrying Value |  |  |  | $ 388,200,000 |  |  | $ 353,473,000 | $ 352,244,000 | 388,200,000
Weighted average note rate (as a percent) |  |  |  |  |  |  | 3.17% | 3.92% |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  | $ 407,696,000 | $ 440,906,000 |
Collateral Loans, Carrying Value |  |  |  |  |  |  | 406,463,000 | 439,691,000 |
Cash, Restricted Cash |  |  |  |  |  |  | 47,230,000 | 20,094,000 |
Replacement period |  |  |  | 3 years |  |  |  |  |
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations |  |  |  | $ 92,700,000 |  |  |  |  |
Maximum period to acquire additional loan obligations |  |  |  | 120 days |  |  |  |  |
Notional amount of secured floating rate notes |  |  |  | $ 123,600,000 |  |  |  |  | 123,600,000
Value of portfolio loans as collateral |  |  |  | $ 387,300,000 |  |  |  |  | $ 387,300,000
Leverage (as a percent) |  |  |  | 74.00% |  |  |  |  | 74.00%
CLO IX | Investment grade |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Debt, Carrying Value |  |  |  | $ 356,400,000 |  |  |  |  | $ 356,400,000
CLO IX | Below investment grade |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Debt, Carrying Value |  |  |  | 31,800,000 |  |  |  |  | 31,800,000
Notional amount of secured floating rate notes |  |  |  | $ 31,800,000 |  |  |  |  | $ 31,800,000
CLO IX | Secured Debt | One-month LIBOR |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Weighted average note rate (as a percent) |  |  |  | 1.36% |  |  |  |  | 1.36%
CLO VIII |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Number of tranches of CLO notes issued | tranche |  |  |  |  |  | 6 |  |  |
Number of newly-formed wholly-owned subsidiaries | item |  |  |  |  |  | 2 |  |  |
Debt, Face Value |  |  |  |  |  | $ 365,000,000 | 282,874,000 | 282,874,000 |
Debt, Carrying Value |  |  |  |  |  | $ 312,100,000 | $ 281,119,000 | $ 279,857,000 |
Weighted average note rate (as a percent) |  |  |  |  |  |  | 3.12% | 3.87% |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  | $ 359,186,000 | $ 354,713,000 |
Collateral Loans, Carrying Value |  |  |  |  |  |  | 357,914,000 | 353,574,000 |
Cash, Restricted Cash |  |  |  |  |  |  | 544,000 | 10,287,000 |
Replacement period |  |  |  |  |  | 3 years |  |  |
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations |  |  |  |  |  | $ 71,300,000 |  |  |
Maximum period to acquire additional loan obligations |  |  |  |  |  | 120 days |  |  |
Notional amount of secured floating rate notes |  |  |  |  |  | $ 82,100,000 |  |  |
Value of portfolio loans as collateral |  |  |  |  |  | $ 293,700,000 |  |  |
Leverage (as a percent) |  |  |  |  |  | 78.00% |  |  |
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 VIII | Secured Debt | One-month LIBOR |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Weighted average note rate (as a percent) |  |  |  |  |  | 1.31% |  |  |
CLO VII |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Debt, Face Value |  |  |  |  |  |  |  | 279,000,000 |
Debt, Carrying Value |  |  |  |  |  |  |  | $ 276,527,000 |
Weighted average note rate (as a percent) |  |  |  |  |  |  |  | 4.56% |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  |  | $ 325,057,000 |
Collateral Loans, Carrying Value |  |  |  |  |  |  |  | 324,195,000 |
Cash, Restricted Cash |  |  |  |  |  |  |  | 30,725,000 |
Debt Instrument Redemption Value | $ 279,000,000 |  |  |  |  |  |  |  |
Proceeds from issuance of collateralized loan obligations for acquiring additional loan obligations |  |  |  |  |  |  | $ 58,600,000 | 25,100,000 |
Deferred fees expensed as interest expense | $ 1,400,000 |  |  |  |  |  |  |  |
CLO VI |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Debt, Face Value |  |  |  |  |  |  |  | 250,250,000 |
Debt, Carrying Value |  |  |  |  |  |  |  | $ 248,536,000 |
Weighted average note rate (as a percent) |  |  |  |  |  |  |  | 5.05% |
Collateral Loans, Unpaid Principal |  |  |  |  |  |  |  | $ 279,348,000 |
Collateral Loans, Carrying Value |  |  |  |  |  |  |  | 278,364,000 |
Cash, Restricted Cash |  |  |  |  |  |  |  | $ 41,404,000 |
Debt Instrument Redemption Value |  | $ 250,300,000 |  |  |  |  |  |  |
Deferred fees expensed as interest expense |  | $ 1,200,000 |  |  |  |  |  |  |
CLO V |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Debt Instrument Redemption Value |  |  | $ 267,800,000 |  |  |  |  |  |
Deferred fees expensed as interest expense |  |  | $ 1,300,000 |  |  |  |  |  |
CLO IV |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |
Debt Instrument Redemption Value |  |  |  |  | $ 219,000,000 |  |  |  |
Deferred fees expensed as interest expense |  |  |  |  | $ 1,100,000 |  |  |  |

X
- Definition Represents the face value of collateral in default, as defined by the CDO indenture, as well as assets deemed to be a credit risk. Credit risk assets are reported by each of the CDOs and are generally defined as the one that, in the CDO collateral manager's reasonable business judgment, has a significant risk of declining in credit quality or, with a passage of time, becoming a defaulted asset. + References No definition available. + Details
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- Definition The cash inflow from amounts received from issuance of collateralized loan obligations. Secured long-term loans are wholly or partially secured by collateral. + References No definition available. + Details
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