RELATED PARTY TRANSACTIONS - Related Party Costs Incurred (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Payable	$ 5,580	$ 4,156
ACREM \| Continuing Operations
Related Party Transaction [Line Items]
Incurred	18,840	15,161	$ 11,912
Payable	5,580	4,156
ACREM \| Continuing Operations \| Management fees
Related Party Transaction [Line Items]
Incurred	11,456	9,384	7,323
Payable	3,026	2,613
ACREM \| Continuing Operations \| Incentive fees
Related Party Transaction [Line Items]
Incurred	3,442	2,752	836
Payable	1,264	830
ACREM \| Continuing Operations \| General and administrative expenses
Related Party Transaction [Line Items]
Incurred	3,777	3,016	3,653
Payable	1,232	703
ACREM \| Continuing Operations \| Direct costs
Related Party Transaction [Line Items]
Incurred	165	9	$ 100
Payable	$ 58	$ 10

Carrying amount as of the balance sheet date of obligations due all related parties.

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+ Details