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JOINT VENTURES AND PARTNERSHIPS - Unconsolidated joint ventures and partnerships (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |  |  |
Total real estate, net | $ 8,741,018 |  | $ 8,741,018 |  |  | $ 8,466,106 |  |
Cash and cash equivalents | 3,370 | $ 833 | 3,370 | $ 833 |  | 1,409 |  | $ 8,106
Other Assets | 184,758 |  | 184,758 |  |  | 188,118 |  |
Total assets | 9,919,271 |  | 9,919,271 |  |  | 9,637,533 |  |
Accounts payable, accrued expenses, and other liabilities | 119,405 |  | 119,405 |  |  | 110,999 |  |
Total liabilities | 6,009,822 |  | 6,009,822 |  |  | 5,522,648 |  |
Total equity | 2,805,173 | 3,414,945 | 2,805,173 | 3,414,945 | $ 3,016,401 | 3,258,591 | $ 3,478,390 | $ 3,389,314
Financial information relating to unconsolidated joint ventures operations |  |  |  |  |  |  |  |
Total revenues | 311,348 | 307,256 | 612,789 | 628,737 |  |  |  |
Property operating expenses | 51,335 | 48,717 | 102,716 | 98,200 |  |  |  |
Real estate depreciation and amortization | 146,169 | 155,056 | 290,257 | 310,532 |  |  |  |
Gain/(loss) on sale of property |  | 61,303 | 50,829 | 61,303 |  |  |  |
Operating income | 35,787 | 91,777 | 110,857 | 130,731 |  |  |  |
Interest expense | (35,404) | (38,597) | (113,560) | (77,914) |  |  |  |
Other income/(loss) | 2,536 | 2,421 | 4,593 | 5,121 |  |  |  |
Net income/(loss) | 12,535 | 62,096 | 15,809 | 67,636 |  |  |  |
Unconsolidated Joint Ventures |  |  |  |  |  |  |  |
Combined summary of balance sheets relating to unconsolidated joint ventures |  |  |  |  |  |  |  |
Total real estate, net | 2,138,303 |  | 2,138,303 |  |  | 1,904,805 |  |
Real Estate Held-for-sale |  |  |  |  |  | 88,458 |  |
Cash and cash equivalents | 18,606 |  | 18,606 |  |  | 22,278 |  |
Other Assets | 240,953 |  | 240,953 |  |  | 150,894 |  |
Total assets | 2,397,862 |  | 2,397,862 |  |  | 2,166,435 |  |
Third party debt, net | 1,259,279 |  | 1,259,279 |  |  | 1,188,710 |  |
Liabilities held for sale |  |  |  |  |  | 55,440 |  |
Accounts payable, accrued expenses, and other liabilities | 38,390 |  | 38,390 |  |  | 40,556 |  |
Total liabilities | 1,297,669 |  | 1,297,669 |  |  | 1,284,706 |  |
Total equity | 1,100,193 |  | 1,100,193 |  |  | $ 881,729 |  |
Financial information relating to unconsolidated joint ventures operations |  |  |  |  |  |  |  |
Total revenues | 32,006 | 37,312 | 64,143 | 78,626 |  |  |  |
Property operating expenses | 16,745 | 14,468 | 33,855 | 29,765 |  |  |  |
Real estate depreciation and amortization | 16,144 | 16,913 | 32,597 | 33,156 |  |  |  |
Gain/(loss) on sale of property |  |  | 34,757 |  |  |  |  |
Operating income | (883) | 5,931 | 32,448 | 15,705 |  |  |  |
Interest expense | (7,460) | (10,149) | (19,594) | (20,496) |  |  |  |
Net realized/unrealized gain/(loss) on held investments | 38,350 | 29,312 | 46,838 | 29,312 |  |  |  |
Other income/(loss) | (14) | 117 | (1,671) | 109 |  |  |  |
Net income/(loss) | $ 29,993 | $ 25,211 | $ 58,021 | $ 24,630 |  |  |  |

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