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Consolidation - Additional Information (Details) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) collateralized_loan_obligation | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($)
Variable Interest Entity [Line Items] |  |  |
Fair value, securities, Level 1 to Level 2 transfers, amount | $ 0 |  | $ 0
CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Number of CLOs consolidated | collateralized_loan_obligation | 5 |  |
Investments | $ 1,722,625,000 | $ 1,555,879,000 |
Consolidated investment products |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments | 1,775,069,000 | $ 1,597,752,000 |
Fair value, securities, Level 2 to Level 1 transfers, amount | 0 |  |
Fair value, securities, Level 1 to Level 2 transfers, amount | 0 |  |
Nonconsolidated VIEs |  |  |
Variable Interest Entity [Line Items] |  |  |
Carrying value and maximum risk of loss | $ 59,800,000 |  |
LIBOR | CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments, basis spread on variable interest rate | 10.00% |  |
LIBOR | Minimum | CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Basis spread on variable interest rate | 0.80% |  |
LIBOR | Maximum | CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Basis spread on variable interest rate | 7.00% |  |
Senior Notes | CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Unpaid principal balance exceeds fair value | $ 12,100,000 |  |
Subordinated Notes - Newfleet CLO 2016-1 | CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt par value | 1,709,300,000.0000 |  |
Subordinated Notes - Newfleet CLO 2016-1 | Warehouse Facility Debt | CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt par value | 90,970,000.00 |  |
Subordinated Notes - Newfleet CLO 2016-1 | Subordinated Debt | CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt par value | 172,300,000.0 |  |
Senior Secured Floating Rate Notes - Newfleet CLO 2016-1 | Senior Notes | CLOs |  |  |
Variable Interest Entity [Line Items] |  |  |
Debt par value | $ 1,446,000,000.0000 |  |

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