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Investments in Real Estate Partnerships - Schedule of Acquisitions by Real Estate Partnerships (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |
Payments to Acquire Businesses, Gross | $ 116,239,000 | $ 191,384,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 9,700,000 | 27,000,000
Unconsolidated Properties [Member] |  |
Business Acquisition [Line Items] |  |
Payments to Acquire Businesses, Gross | 346,862,000 | 15,075,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 100,233,000 | $ 0
Unconsolidated Properties [Member] | Ballard Blocks I [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Effective Date of Acquisition | Jan. 02, 2018 |
Business Acquisition, Name of Acquired Entity | Ballard Blocks I |
Business Acquisition Location, City and State | Seattle, WA |
Business Acquisition, Description of Acquired Entity | Operating |
Business Acquisition, Co-investment Partner | Other |
Equity Method Investment, Ownership Percentage | 49.90% |
Payments to Acquire Businesses, Gross | $ 54,500,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 0 |
Unconsolidated Properties [Member] | Ballard Blocks II [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Effective Date of Acquisition | Jan. 02, 2018 |
Business Acquisition, Name of Acquired Entity | Ballard Blocks II |
Business Acquisition Location, City and State | Seattle, WA |
Business Acquisition, Description of Acquired Entity | Development |
Business Acquisition, Co-investment Partner | Other |
Equity Method Investment, Ownership Percentage | 49.90% |
Payments to Acquire Businesses, Gross | $ 4,000,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 0 |
Unconsolidated Properties [Member] | Metuchen [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Effective Date of Acquisition | Jan. 05, 2018 |
Business Acquisition, Name of Acquired Entity | The District at Metuchen |
Business Acquisition Location, City and State | Metuchen, NJ |
Business Acquisition, Description of Acquired Entity | Operating |
Business Acquisition, Co-investment Partner | Columbia II |
Equity Method Investment, Ownership Percentage | 20.00% |
Payments to Acquire Businesses, Gross | $ 33,830,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 0 |
Unconsolidated Properties [Member] | Crossroad Commons II [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Effective Date of Acquisition | May 18, 2018 |
Business Acquisition, Name of Acquired Entity | Crossroads Commons II |
Business Acquisition Location, City and State | Boulder, CO |
Business Acquisition, Description of Acquired Entity | Operating |
Business Acquisition, Co-investment Partner | Columbia I |
Equity Method Investment, Ownership Percentage | 20.00% |
Payments to Acquire Businesses, Gross | $ 10,500,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 0 |
Unconsolidated Properties [Member] | Ridgewood [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Effective Date of Acquisition | Sep. 07, 2018 |
Business Acquisition, Name of Acquired Entity | Ridgewood Shopping Center |
Business Acquisition Location, City and State | Raleigh, NC |
Business Acquisition, Description of Acquired Entity | Operating |
Business Acquisition, Co-investment Partner | Columbia II |
Equity Method Investment, Ownership Percentage | 20.00% |
Payments to Acquire Businesses, Gross | $ 45,800,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 10,233,000 |
Unconsolidated Properties [Member] | Shoppes at Bartram Park [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Effective Date of Acquisition | Dec. 17, 2018 |
Business Acquisition, Name of Acquired Entity | Shoppes at Bartram Park |
Business Acquisition Location, City and State | Jacksonville, FL |
Business Acquisition, Description of Acquired Entity | Operating (1) |
Business Acquisition, Co-investment Partner | Other |
Equity Method Investment, Ownership Percentage | 50.00% |
Payments to Acquire Businesses, Gross | $ 984,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 0 |
Unconsolidated Properties [Member] | Town and Country [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Effective Date of Acquisition | Dec. 14, 2018 |
Business Acquisition, Name of Acquired Entity | Town and Country Center |
Business Acquisition Location, City and State | Los Angeles, CA |
Business Acquisition, Description of Acquired Entity | Operating |
Business Acquisition, Co-investment Partner | Other |
Equity Method Investment, Ownership Percentage | 9.38% |
Payments to Acquire Businesses, Gross | $ 197,248,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 90,000,000 |
Unconsolidated Properties [Member] | Midtown East [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Effective Date of Acquisition |  | Oct. 11, 2017
Business Acquisition, Name of Acquired Entity |  | Midtown East
Business Acquisition Location, City and State |  | Raleigh, NC
Business Acquisition, Description of Acquired Entity |  | Development
Business Acquisition, Co-investment Partner |  | Other
Equity Method Investment, Ownership Percentage |  | 50.00%
Payments to Acquire Businesses, Gross |  | $ 15,075,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 0
Off-Market Favorable Lease [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 8,371,000 | 8,929,000
Off-Market Favorable Lease [Member] | Unconsolidated Properties [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 13,889,000 | 0
Off-Market Favorable Lease [Member] | Unconsolidated Properties [Member] | Ballard Blocks I [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 3,668,000 |
Off-Market Favorable Lease [Member] | Unconsolidated Properties [Member] | Ballard Blocks II [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 |
Off-Market Favorable Lease [Member] | Unconsolidated Properties [Member] | Metuchen [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 3,147,000 |
Off-Market Favorable Lease [Member] | Unconsolidated Properties [Member] | Crossroad Commons II [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 447,000 |
Off-Market Favorable Lease [Member] | Unconsolidated Properties [Member] | Ridgewood [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 3,372,000 |
Off-Market Favorable Lease [Member] | Unconsolidated Properties [Member] | Shoppes at Bartram Park [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 |
Off-Market Favorable Lease [Member] | Unconsolidated Properties [Member] | Town and Country [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 3,255,000 |
Off-Market Favorable Lease [Member] | Unconsolidated Properties [Member] | Midtown East [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 0
Off-Market Lease, Unfavorable [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 7,422,000 | 17,562,000
Off-Market Lease, Unfavorable [Member] | Unconsolidated Properties [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 12,952,000 | 0
Off-Market Lease, Unfavorable [Member] | Unconsolidated Properties [Member] | Ballard Blocks I [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 2,350,000 |
Off-Market Lease, Unfavorable [Member] | Unconsolidated Properties [Member] | Ballard Blocks II [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 |
Off-Market Lease, Unfavorable [Member] | Unconsolidated Properties [Member] | Metuchen [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 1,905,000 |
Off-Market Lease, Unfavorable [Member] | Unconsolidated Properties [Member] | Crossroad Commons II [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 769,000 |
Off-Market Lease, Unfavorable [Member] | Unconsolidated Properties [Member] | Ridgewood [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 2,278,000 |
Off-Market Lease, Unfavorable [Member] | Unconsolidated Properties [Member] | Shoppes at Bartram Park [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 |
Off-Market Lease, Unfavorable [Member] | Unconsolidated Properties [Member] | Town and Country [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 5,650,000 |
Off-Market Lease, Unfavorable [Member] | Unconsolidated Properties [Member] | Midtown East [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | $ 0

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