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Real Estate Investments Business Acquisitions (Details) shares in Thousands, $ in Thousands |  | 9 Months Ended
--- | --- | ---
Mar. 01, 2017 USD ($) property shares | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 USD ($)
Business Acquisition [Line Items] |  |  |
Purchase Price |  | $ 248,463 | $ 37,800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | $ 19,933 | 0
Parent Company [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Conversion of Stock, Conversion Ratio |  | 0.45 |
Shares of common stock issued for merger (in shares) | shares |  | 65,500 |
Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | $ 18,741 | 90
Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | $ 14,724 | $ 9
Ballard Blocks I [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  | Jan. 02, 2018 |
Property Name |  | Ballard Blocks I |
City/State |  | Seattle, WA |
Business Acquisition, Percentage of Voting Interests Acquired |  | 49.90% |
Purchase Price |  | $ 54,500 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 0 |
Ballard Blocks I [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 3,668 |
Ballard Blocks I [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | $ 2,350 |
Ballard Blocks II [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  | Jan. 02, 2018 |
Property Name |  | Ballard Blocks II |
City/State |  | Seattle, WA |
Business Acquisition, Percentage of Voting Interests Acquired |  | 49.90% |
Purchase Price |  | $ 4,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 0 |
Ballard Blocks II [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 0 |
Ballard Blocks II [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | $ 0 |
Metuchen [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  | Jan. 05, 2018 |
Property Name |  | The District at Metuchen |
City/State |  | Metuchen, NJ |
Business Acquisition, Percentage of Voting Interests Acquired |  | 20.00% |
Purchase Price |  | $ 33,830 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 0 |
Metuchen [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 3,147 |
Metuchen [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | $ 1,905 |
Hewlett Crossing I & II [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  | Jan. 10, 2018 |
Property Name |  | Hewlett Crossing I & II |
City/State |  | Hewlett, NY |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00% |
Purchase Price |  | $ 30,900 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 9,700 |
Hewlett Crossing I & II [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 3,114 |
Hewlett Crossing I & II [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | $ 1,868 |
Rivertowns [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  | Apr. 03, 2018 |
Property Name |  | Rivertowns Square |
City/State |  | Dobbs Ferry, NY |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00% |
Purchase Price |  | $ 68,933 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 0 |
Rivertowns [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 4,993 |
Rivertowns [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | $ 5,554 |
Crossroad Commons II [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  | May 18, 2018 |
Property Name |  | Crossroads Commons II |
City/State |  | Boulder, CO |
Business Acquisition, Percentage of Voting Interests Acquired |  | 20.00% |
Purchase Price |  | $ 10,500 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 0 |
Crossroad Commons II [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 447 |
Crossroad Commons II [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | $ 769 |
Ridgewood [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  | Sep. 07, 2018 |
Property Name |  | Ridgewood Shopping Center |
City/State |  | Raleigh, NC |
Business Acquisition, Percentage of Voting Interests Acquired |  | 20.00% |
Purchase Price |  | $ 45,800 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 10,233 |
Ridgewood [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | 3,372 |
Ridgewood [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  | $ 2,278 |
The Field at Commonwealth [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  |  | Mar. 06, 2017
Property Name |  |  | The Field at Commonwealth
City/State |  |  | Chantilly, VA
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 100.00%
Purchase Price |  |  | $ 9,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  | 0
The Field at Commonwealth [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  |  | 0
The Field at Commonwealth [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  |  | $ 0
Pinecrest Place [Member] [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  |  | Mar. 08, 2017
Property Name |  |  | Pinecrest Place (1)
City/State |  |  | Miami, FL
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 100.00%
Purchase Price |  |  | $ 0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  | 0
Pinecrest Place [Member] [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  |  | 0
Pinecrest Place [Member] [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  |  | $ 0
Mellody Farm [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  |  | Apr. 13, 2017
Property Name |  |  | Mellody Farm (2)
City/State |  |  | Chicago, IL
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 100.00%
Purchase Price |  |  | $ 26,200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  | 0
Mellody Farm [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  |  | 0
Mellody Farm [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  |  | $ 0
Klahanie Shopping Center [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  |  | Jun. 28, 2017
Property Name |  |  | Concord outparcel (3)
City/State |  |  | Miami, FL
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 100.00%
Purchase Price |  |  | $ 350
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  | 0
Klahanie Shopping Center [Member] | Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  |  | 0
Klahanie Shopping Center [Member] | Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets |  |  | $ 0
Aventura Square [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 100.00%
Equity One Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 1,383,291 |  |
Intangible assets | $ 458,877 |  |
Shares of common stock issued for merger (in shares) | shares | 65,379 |  |
Number of real estate properties acquired | property | 121 |  |
Equity One Inc. [Member] | Partially Owned Properties [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of real estate properties acquired | property | 8 |  |

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