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REAL ESTATE INVESTMENTS - Schedule of Gross Carrying Value of Operating Properties (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Real Estate [Line Items] |  |
Land | $ 404,849 | $ 410,144
Building and improvements | 2,743,280 | 2,653,492
Tenant improvements | 438,954 | 408,966
Total | 3,587,083 | 3,472,602
Discontinued Operations |  |
Real Estate [Line Items] |  |
Total | 21,050 | 0
Continuing Operations |  |
Real Estate [Line Items] |  |
Total | $ 3,608,133 | $ 3,472,602

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