FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in marketable securities	$ 26,987	$ 36,825
Real estate loans held in consolidated CMBS Trust, at fair value	1,156,263	0
Total	1,183,250
Bonds payable held in consolidated CMBS Trust, at fair value	1,125,096	0
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in marketable securities	26,987	36,825
Real estate loans held in consolidated CMBS Trust, at fair value	0
Total	26,987
Bonds payable held in consolidated CMBS Trust, at fair value	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in marketable securities	0	0
Real estate loans held in consolidated CMBS Trust, at fair value	1,156,263
Total	1,156,263
Bonds payable held in consolidated CMBS Trust, at fair value	1,125,096
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in marketable securities	0	$ 0
Real estate loans held in consolidated CMBS Trust, at fair value	0
Total	0
Bonds payable held in consolidated CMBS Trust, at fair value	$ 0