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Real Estate Investments Business Acquisitions (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2016 | Jun. 30, 2015
Business Acquisition [Line Items] |  |  |
Document Period End Date |  | Jun. 30, 2016 |
Purchase Price |  | $ 315,794,000 | $ 0
Market Common Clarendon [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Date Purchased |  | May 16, 2016 |
Property Name |  | Market Common Clarendon (2) |
City/State |  | Arlington, VA |
Business Acquisition, Description of Acquired Entity |  | Operating |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% | 100.00% |
Purchase Price |  | $ 280,500,000 |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual | $ 2,287,000 | $ 2,287,000 |
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, Description of Acquired Entity |  | Operating |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% | 100.00% |
Purchase Price |  | $ 17,300,000 |
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, Description of Acquired Entity |  | Development |
Business Acquisition, Percentage of Voting Interests Acquired | 53.00% | 53.00% |
Purchase Price |  | $ 17,994,000 |
Non-controlling interest recorded, fair value | $ 8,400,000 | 8,400,000 |
Parent Company [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Contributions from limited partners in consolidated partnerships, net |  | 8,420,000 | 13,000
Payments for Deposits on Real Estate Acquisitions |  | 1,500,000 | 4,500,000
Partnership Interest [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Contributions from limited partners in consolidated partnerships, net |  | 8,420,000 | 13,000
Payments for Deposits on Real Estate Acquisitions |  | 1,500,000 | 4,500,000
Non-controlling interest recorded, fair value | 0 | 0 | $ 0
Off-Market Favorable Lease [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 25,599,000 | 25,599,000 |
Off-Market Favorable Lease [Member] | Market Common Clarendon [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 15,428,000 | 15,428,000 |
Off-Market Favorable Lease [Member] | Garden City [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 10,171,000 | 10,171,000 |
Off-Market Favorable Lease [Member] | The Market at Springwoods Village [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 0 | 0 |
Off-Market Lease, Unfavorable [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 18,602,000 | 18,602,000 |
Off-Market Lease, Unfavorable [Member] | Market Common Clarendon [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 15,662,000 | 15,662,000 |
Off-Market Lease, Unfavorable [Member] | Garden City [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 2,940,000 | 2,940,000 |
Off-Market Lease, Unfavorable [Member] | The Market at Springwoods Village [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 0 | $ 0 |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Cash outflow related to amounts given in advance to show or confirm an intention to complete an acquisition of land, buildings, other structures, or any item classified as real estate. + References No definition available. + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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