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REAL ESTATE INVESTMENTS - Purchase Price Allocation (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 19, 2018 | Dec. 11, 2018 | Jan. 05, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Mortgage notes payable, net |  |  |  | $ 0 | $ 313,812 |
Repayments of Secured Debt |  |  |  | $ 94,993 | $ 7,595 | $ 122,180
Quarry Lake II |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Building, land and improvements | $ 35,120 |  |  |  |  |
Intangible assets acquired | 5,809 |  |  |  |  |
Below market lease liabilities assumed | (1,524) |  |  |  |  |
Deferred gain | 0 |  |  |  |  |
Total unencumbered acquisition value | 39,405 |  |  |  |  |
Mortgage debt assumed - at fair value | 0 |  |  |  |  |
Total encumbered acquisition value | 39,405 |  |  |  |  |
Mortgage debt repaid at settlement | 0 |  |  |  |  |
Investment in unconsolidated real estate ventures | 0 |  |  |  |  |
Gain on promoted interest in unconsolidated real estate venture | 0 |  |  |  |  |
Gain on real estate venture transactions | 0 |  |  |  |  |
Purchase price reduction for note receivable | 0 |  |  |  |  |
Net working capital assumed | (368) |  |  |  |  |
Total cash payment at settlement | $ 39,037 |  |  |  |  |
DRA Austin Venture |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Building, land and improvements |  | $ 457,390 |  |  |  |
Intangible assets acquired |  | 76,925 |  |  |  |
Below market lease liabilities assumed |  | (13,769) |  |  |  |
Deferred gain |  | 14,594 |  |  |  |
Total unencumbered acquisition value |  | 535,140 |  |  |  |
Mortgage debt assumed - at fair value |  | 0 |  |  |  |
Total encumbered acquisition value |  | 535,140 |  |  |  |
Mortgage debt repaid at settlement |  | (115,461) |  |  |  |
Investment in unconsolidated real estate ventures |  | (14,594) |  |  |  |
Gain on promoted interest in unconsolidated real estate venture |  | (28,283) |  |  |  |
Gain on real estate venture transactions |  | (103,847) |  |  |  |
Purchase price reduction for note receivable |  | (130,742) |  |  |  |
Net working capital assumed |  | (24,865) |  |  |  |
Total cash payment at settlement |  | $ 117,348 |  |  |  |
Four Tower Bridge |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Building, land and improvements |  |  | $ 20,734 |  |  |
Intangible assets acquired |  |  | 3,144 |  |  |
Below market lease liabilities assumed |  |  | (182) |  |  |
Deferred gain |  |  | 0 |  |  |
Total unencumbered acquisition value |  |  | 23,696 |  |  |
Mortgage debt assumed - at fair value |  |  | (9,940) |  |  |
Total encumbered acquisition value |  |  | 13,756 |  |  |
Mortgage debt repaid at settlement |  |  | 0 |  |  |
Investment in unconsolidated real estate ventures |  |  | (3,502) |  |  |
Gain on promoted interest in unconsolidated real estate venture |  |  | 0 |  |  |
Gain on real estate venture transactions |  |  | (11,633) |  |  |
Purchase price reduction for note receivable |  |  | 0 |  |  |
Net working capital assumed |  |  | 1,379 |  |  |
Total cash payment at settlement |  |  | $ 0 |  |  |
Intangible Assets Acquired | Quarry Lake II |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Weighted average amortization period | 0 years |  |  |  |  |
Intangible Assets Acquired | DRA Austin Venture |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Weighted average amortization period |  | 5 years 6 months |  |  |  |
Intangible Assets Acquired | Four Tower Bridge |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Weighted average amortization period |  |  | 4 years 1 month 6 days |  |  |
Below Market Lease | Quarry Lake II |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Weighted average amortization period | 3 years |  |  |  |  |
Below Market Lease | DRA Austin Venture |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Weighted average amortization period |  | 4 years 7 months 6 days |  |  |  |
Below Market Lease | Four Tower Bridge |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Weighted average amortization period |  |  | 4 years 9 months 18 days |  |  |
Mortgage Debt Assumed - at Fair Value |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Repayments of Secured Debt |  | $ 115,500 |  |  |  |
Mortgage Debt Assumed - at Fair Value | Four Tower Bridge |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Mortgage notes payable, net |  |  | $ 9,700 |  |  |

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