COMMITMENTS AND CONTINGENCIES - Additional information (Details) - STRS JV - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2022	Dec. 31, 2021
Unfunded commitments
Commitments to fund equity interests	$ 20,000	$ 15,000
Commitments to subordinated notes	$ 80,000	$ 60,000

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