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REAL ESTATE INVESTMENTS - Schedule of Gross Carrying Value of Operating Properties (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Long Lived Assets Held-for-sale [Line Items] |  |
Total | $ 3,696,066 | $ 3,617,240
Continuing Operations |  |
Long Lived Assets Held-for-sale [Line Items] |  |
Land | 414,179 | 403,998
Building and improvements | 2,783,304 | 2,760,357
Tenant improvements | $ 498,583 | $ 452,885

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