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Consolidation - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) collateralizedLoanObligation	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)
CLOs
Variable Interest Entity [Line Items]
Number of CLOs consolidated | collateralizedLoanObligation	6
Investments	$ 2,203,258	$ 2,217,055
Nonconsolidated
Variable Interest Entity [Line Items]
Carrying value and maximum risk of loss	$ 30,600
LIBOR | CLOs
Variable Interest Entity [Line Items]
Investments, basis spread on variable interest rate	10.00%
Senior Notes | CLOs
Variable Interest Entity [Line Items]
Unpaid principal balance exceeds fair value	$ 39,200
Subordinated Notes - Newfleet CLO 2016-1 | CLOs
Variable Interest Entity [Line Items]
Debt par value	$ 2,400,000
Subordinated Notes - Newfleet CLO 2016-1 | Subordinated Debt | CLOs
Variable Interest Entity [Line Items]
Debt par value			$ 225,900
Senior Secured Floating Rate Notes - Newfleet CLO 2016-1 | Senior Notes | CLOs
Variable Interest Entity [Line Items]
Debt par value			$ 2,200,000
Minimum | Senior Secured Floating Rate Notes - Newfleet CLO 2016-1 | LIBOR | CLOs
Variable Interest Entity [Line Items]
Basis spread on variable rate	0.80%
Maximum | Senior Secured Floating Rate Notes - Newfleet CLO 2016-1 | LIBOR | CLOs
Variable Interest Entity [Line Items]
Basis spread on variable rate	8.70%

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Number of Collateralized Loan Obligations Consolidated

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