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Real Estate Investments Business Acquisitions (Details) shares in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 01, 2017 USD ($) property shares | Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) shares | Jun. 30, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |
Purchase Price |  |  | $ 36,050,000 | $ 315,794,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | $ 0 | $ 0 | $ 0
Concord Outparcel [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% | 100.00% |
Purchase Price |  |  | $ 350,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | $ 0 | 0 |
Intangible assets |  | $ 0 | $ 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% | 100.00% |
Purchase Price |  |  | $ 26,200,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | $ 0 | 0 |
Market Common Clarendon [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date Purchased |  |  |  | May 16, 2016
Property Name |  |  |  | Market Common Clarendon
City/State |  |  |  | Arlington, VA
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 100.00%
Purchase Price |  |  |  | $ 280,500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  | $ 0
Equity One Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of real estate properties acquired | property | 121 |  |  |
Shares of common stock issued for merger (in shares) | shares | 65,379 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | $ 1,493,966,000 |  |  |
Intangible assets | $ 463,882,000 |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | $ 100,864,000 | $ 135,813,000 |
Garden City [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% | 100.00% |
Purchase Price |  |  | $ 9,500,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | $ 0 | $ 0 |
The Market at Springwoods Village [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date Purchased |  |  |  | Mar. 04, 2016
Property Name |  |  |  | The Market at Springwoods Village (1)
City/State |  |  |  | Houston, TX
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 53.00%
Purchase Price |  |  |  | $ 17,994,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  | $ 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% | 100.00% |
Purchase Price |  |  | $ 0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | $ 0 | $ 0 |
Garden City [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date Purchased |  |  |  | Feb. 22, 2016
Property Name |  |  |  | Garden City Park
City/State |  |  |  | Garden City Park, NY
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 100.00%
Purchase Price |  |  |  | $ 17,300,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  | 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 |
Partially Owned Properties [Member] | Equity One Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of real estate properties acquired | property | 8 |  |  |
Off-Market Favorable Lease [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  | 0 | $ 0 | 25,599,000
Off-Market Favorable Lease [Member] | Mellody Farm [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  | 0 | 0 |
Off-Market Favorable Lease [Member] | Market Common Clarendon [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  |  |  | 15,428,000
Off-Market Favorable Lease [Member] | Garden City [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  | 0 | 0 |
Off-Market Favorable Lease [Member] | The Market at Springwoods Village [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  |  |  | 0
Off-Market Favorable Lease [Member] | Pinecrest Place [Member] [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  | 0 | 0 |
Off-Market Favorable Lease [Member] | Garden City [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  |  |  | 10,171,000
Off-Market Lease, Unfavorable [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  | 0 | 0 | 18,602,000
Off-Market Lease, Unfavorable [Member] | Mellody Farm [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  |  |  |
Off-Market Lease, Unfavorable [Member] | Market Common Clarendon [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  |  |  | 15,662,000
Off-Market Lease, Unfavorable [Member] | Garden City [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  | 0 | 0 |
Off-Market Lease, Unfavorable [Member] | The Market at Springwoods Village [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  |  |  | 0
Off-Market Lease, Unfavorable [Member] | Pinecrest Place [Member] [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  | $ 0 | $ 0 |
Off-Market Lease, Unfavorable [Member] | Garden City [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets |  |  |  | $ 2,940,000

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