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Investments in Real Estate Partnerships - Schedule of Acquisitions by Real Estate Partnerships (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Ownership Percentage |  | 0.00% | 0.00%
Purchase Price |  | $ 287,527 | $ 116,239
Debt Assumed, Net of Premiums |  | 0 | 9,700
Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible Assets |  | 7,153 | 7,422
Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible Assets |  | $ 21,649 | 8,371
Unconsolidated Properties [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Price |  |  | 346,862
Debt Assumed, Net of Premiums |  |  | 100,233
Unconsolidated Properties [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible Assets |  |  | 12,952
Unconsolidated Properties [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible Assets |  |  | $ 13,889
Unconsolidated Properties [Member] | Ballard Blocks I [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  |  | Jan. 02, 2018
Property Name |  |  | Ballard Blocks I
City/State |  |  | Seattle, WA
Business Acquisition, Description of Acquired Entity |  |  | Operating
Business Acquisition, Co-investment Partner |  |  | Other
Ownership Percentage |  |  | 49.90%
Purchase Price |  |  | $ 54,500
Unconsolidated Properties [Member] | Ballard Blocks I [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible Assets |  |  | 2,350
Unconsolidated Properties [Member] | Ballard Blocks I [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible Assets |  |  | $ 3,668
Unconsolidated Properties [Member] | Ballard Blocks II [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  |  | Jan. 02, 2018
Property Name |  |  | Ballard Blocks II
City/State |  |  | Seattle, WA
Business Acquisition, Description of Acquired Entity |  |  | Development
Business Acquisition, Co-investment Partner |  |  | Other
Ownership Percentage |  |  | 49.90%
Purchase Price |  |  | $ 4,000
Unconsolidated Properties [Member] | Metuchen [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  |  | Jan. 05, 2018
Property Name |  |  | The District at Metuchen
City/State |  |  | Metuchen, NJ
Business Acquisition, Description of Acquired Entity |  |  | Operating
Business Acquisition, Co-investment Partner |  |  | Columbia II
Ownership Percentage |  |  | 20.00%
Purchase Price |  |  | $ 33,830
Unconsolidated Properties [Member] | Metuchen [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible Assets |  |  | 1,905
Unconsolidated Properties [Member] | Metuchen [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible Assets |  |  | $ 3,147
Unconsolidated Properties [Member] | Crossroad Commons II [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  |  | May 18, 2018
Property Name |  |  | Crossroads Commons II
City/State |  |  | Boulder, CO
Business Acquisition, Description of Acquired Entity |  |  | Operating
Business Acquisition, Co-investment Partner |  |  | Columbia I
Ownership Percentage |  |  | 20.00%
Purchase Price |  |  | $ 10,500
Unconsolidated Properties [Member] | Crossroad Commons II [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible Assets |  |  | 769
Unconsolidated Properties [Member] | Crossroad Commons II [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible Assets |  |  | $ 447
Unconsolidated Properties [Member] | Ridgewood [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  |  | Sep. 07, 2018
Property Name |  |  | Ridgewood Shopping Center
City/State |  |  | Raleigh, NC
Business Acquisition, Description of Acquired Entity |  |  | Operating
Business Acquisition, Co-investment Partner |  |  | Columbia II
Ownership Percentage |  |  | 20.00%
Purchase Price |  |  | $ 45,800
Debt Assumed, Net of Premiums |  |  | 10,233
Unconsolidated Properties [Member] | Ridgewood [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible Assets |  |  | 2,278
Unconsolidated Properties [Member] | Ridgewood [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible Assets |  |  | $ 3,372
Unconsolidated Properties [Member] | Shoppes at Bartram Park [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  |  | Dec. 17, 2018
Property Name |  |  | Shoppes at Bartram Park
City/State |  |  | Jacksonville, FL
Business Acquisition, Description of Acquired Entity | [1] |  | Operating (1)
Business Acquisition, Co-investment Partner |  |  | Other
Ownership Percentage |  |  | 50.00%
Purchase Price |  |  | $ 984
Unconsolidated Properties [Member] | Town and Country [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  |  | Dec. 14, 2018
Property Name |  |  | Town and Country Center
City/State |  |  | Los Angeles, CA
Business Acquisition, Description of Acquired Entity |  |  | Operating
Business Acquisition, Co-investment Partner |  |  | Other
Ownership Percentage |  |  | 9.38%
Purchase Price |  |  | $ 197,248
Debt Assumed, Net of Premiums |  |  | 90,000
Unconsolidated Properties [Member] | Town and Country [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible Assets |  |  | 5,650
Unconsolidated Properties [Member] | Town and Country [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible Assets |  |  | $ 3,255
[1] | Land parcels purchased as additions to the existing operating property.

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