REAL ESTATE HELD FOR INVESTMENT - Real Estate Sales (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 28, 2023 USD ($) a	Jun. 30, 2023 USD ($) property	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) property	Jun. 30, 2022 USD ($)	May 31, 2023 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of real estate		$ 3,292	$ (175)	$ 32,761	$ 3,348
Income tax expense (benefit)		$ 0	$ 0	$ (3,662)	$ 0
Office Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | property		8		8
Madison Square School | Office Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | property		3		3
Madison Square School | Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration						$ 6,400
Park Highlands | Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration	$ 34,500
Gain on sale of real estate	$ 29,500
Area of land (in acres) | a	71
Closing costs and credits for development obligations	$ 1,900
Income tax expense (benefit)				$ (3,700)