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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Narrative (Details) $ in Thousands, ft² in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) a ft² investment apartment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Investment in Real Estate Ventures, equity method | $ 120,294 | $ 169,100 | $ 194,621
Accounts receivable | 16,363 | 16,394 |
Real Estate Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Accounts receivable | 800 |  |
Real Estate Venture | Management Fees |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Service and other revenue | 4,300 | 6,300 | 6,400
Real Estate Venture | Leasing Commission Income |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Service and other revenue | 1,700 | $ 2,500 | $ 4,500
Unconsolidated Real Estate Ventures |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment in Real Estate Ventures, equity method | $ 120,300 |  |
Unconsolidated Real Estate Ventures | Minimum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 15.00% |  |
Unconsolidated Real Estate Ventures | Maximum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage | 70.00% |  |
Unconsolidated Real Estate Ventures | Six Real Estate Ventures | Office Properties |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of unconsolidated investments In real estate ventures | investment | 3 |  |
Rentable square feet | ft² | 5.4 |  |
Unconsolidated Real Estate Ventures | Two Real Estate Ventures | Land Held For Development |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of unconsolidated investments In real estate ventures | investment | 2 |  |
Acres | a | 1.4 |  |
Unconsolidated Real Estate Ventures | One Real Estate Venture | Land Under Active Development |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of unconsolidated investments In real estate ventures | investment | 1 |  |
Acres | a | 1.3 |  |
Unconsolidated Real Estate Ventures | Two Other Real Estate Ventures | Residential Tower |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of unconsolidated investments In real estate ventures | investment | 1 |  |
Number of property units | apartment | 321 |  |
Parent Company | Unconsolidated Real Estate Ventures |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of unconsolidated investments In real estate ventures | investment | 7 |  |

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