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DERIVATIVE INSTRUMENTS - Narrative (Details) - USD ($)	Feb. 25, 2022	Dec. 23, 2020	Sep. 30, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value			$ 7,974,000	$ (15,169,000)
Foreign Exchange Contract
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative asset			8,240,000	1,508,000
Fair value			7,974,000	(15,169,000)
Barings LLC | MVC Credit Support Agreement
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount		$ 23,000,000	23,000,000	23,000,000
Term of contract		10 years
Derivative asset			16,800,000	12,386,000
Barings LLC | Sierra Credit Support Agreement
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	$ 100,000,000		100,000,000	100,000,000
Term of contract	10 years
Derivative asset			$ 37,400,000	$ 40,700,000

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