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SUPPLEMENTAL AND NONCASH INFORMATION - Summary (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Significant Noncash Transactions [Line Items] |  |  |
Additions to real estate assets accrued but not yet paid | $ 5,945 | $ 24,642 | $ 22,791
Accrued dividends and distributions payable |  |  | 17,130
Decrease in real estate assets | (57,001) | (60,059) |
Decrease in mortgage and other indebtedness | 85,371 | 124,111 |
Increase (decrease) in operating assets and liabilities | 4,288 | 9,333 |
Decrease in intangible lease and other assets | (137) | (1,663) |
Conversion of Operating Partnership common units into shares of common stock | $ 21,163 | 730 | 3,059
Deconsolidation upon contribution/assignment of interest in joint venture |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |
Decrease in real estate assets |  | (200,343) | (8,221)
Increase in investment in unconsolidated affiliates |  | 39,708 | $ 8,174
Decrease in mortgage and other indebtedness |  | 228,627 |
Increase (decrease) in operating assets and liabilities |  | 857 |
Decrease in intangible lease and other assets |  | (4,815) |
Increase in noncontrolling interest and joint venture interest |  | $ (12,013) |

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