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Real Estate Transactions Property Transactions (Discontinued Operations) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 02, 2015 USD ($) | Jul. 15, 2015 USD ($) ft² a
Discontinued Operations [Line Items] |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  | $ 131,000 |
Income (Loss) from Discontinued Operations | $ 6 | $ 348 | $ (14) | $ 1,806 |  |
Gain (Loss) on Disposal of Discontinued Operation | $ 0 | $ 12,993 | (551) | $ 19,372 |  |
Spring & 8th/ NCR [Member] |  |  |  |  |  |
Discontinued Operations [Line Items] |  |  |  |  |  |
Area of Land | a |  |  |  |  |  | 4.16
Business Combination Purchase Price |  |  |  |  |  | $ 27,000
Net Rentable Area | ft² |  |  |  |  |  | 485,000
2100 Ross Avenue [Member] |  |  |  |  |  |
Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (Loss) on Disposal of Discontinued Operation |  |  | $ 36,200 |  |  |
Net Rentable Area | ft² |  |  |  |  |  | 844,000

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