REAL ESTATE INVESTMENTS - 3151 Market Venture (Narrative) (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Jul. 14, 2022 USD ($) ft²	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) ft²	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 30, 2023 ft²
Schedule of Investments [Line Items]
Area of real estate property | ft²			13,011,094
Net gain on disposition of real estate			$ 7,736	$ 17,677	$ 142
Land | 3151 Market Street
Schedule of Investments [Line Items]
Area of real estate property | ft²	500,000
Leasehold Interest | 3151 Market Street
Schedule of Investments [Line Items]
Lease agreement term (in years)	99 years
Sales price	$ 30,400
Net gain on disposition of real estate	$ 2,600
Operating lease costs, capitalized		$ 7,800
Rentable area (in square feet) | ft²						200,000
Net gain from remeasurement of investment in real estate ventures		$ 800