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Segment Information - Real Estate Investments (Parentheticals) (Details) | Dec. 31, 2015 property | Jun. 22, 2015
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Segment Reporting Information [Line Items] |  |
Number of Properties | 179 |
Broadmoor Austin Associates [Member] |  |
Segment Reporting Information [Line Items] |  |
Percentage of ownership interests |  | 50.00%
Cira Square [Member] | Held for Sale Properties Included in Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of Properties | 58 |

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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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- Details
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