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Real Estate Assets (Details) ft² in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) ft² property | Jun. 30, 2015 USD ($) ft² | Mar. 31, 2015 USD ($) property | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) ft² property | Sep. 30, 2014 USD ($)
Acquisitions [Abstract] |  |  |  |  |  |
Contingent consideration in connection with the acquisition of land |  |  |  |  | $ 900 | $ 0
Acquisition-related costs | $ 900 |  |  |  | 1,000 |
Dispositions [Abstract] |  |  |  |  |  |
Gain on disposition of property | $ 7,012 |  |  | $ 36,238 | $ 10,581 | $ 42,185
Tampa, FL Building Acquisition (09/2015) [Member] |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |
Acquisition rentable square feet (in sq. ft.) | ft² | 528 |  |  |  | 528 |
Purchase price of acquisition | $ 113,500 |  |  |  |  |
Tampa, FL Land Acquisition (09/2015) [Member] |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |
Purchase price of acquisition | $ 2,200 |  |  |  |  |
Atlanta, GA Building Acquisition (09/2015) [Member] |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |
Acquisition rentable square feet (in sq. ft.) | ft² | 896 |  |  |  | 896 |
Number of office properties acquired | property | 2 |  |  |  | 2 |
Purchase price of acquisition | $ 290,300 |  |  |  |  |
Atlanta, GA Land Acquisition [Member] (6/2015) [Member] |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |
Purchase price of acquisition |  | $ 5,200 |  |  |  |
Contingent consideration in connection with the acquisition of land |  | $ 900 |  |  |  |
Orlando, FL Building Acquisition [Member] (6/2015) [Member] |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |
Acquisition rentable square feet (in sq. ft.) | ft² |  | 168 |  |  |  |
Percentage of equity interest acquired in unconsolidated affiliate (in hundredths) |  | 77.20% |  |  |  |
Fair value of debt assumed in connection with the acquisition |  | $ 19,300 |  |  |  |
Building Dispositions [Member] |  |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |  |
Number of buildings sold | property |  |  | 2 |  |  |
Purchase price of real estate | 15,300 |  | $ 3,500 |  |  |
Gain on disposition of property | 6,500 |  | 400 |  |  |
Land Dispositions [Member] |  |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |  |
Purchase price of real estate | 1,800 | 500 | 2,500 |  |  |
Gain on disposition of property | $ 500 | $ 200 | $ 800 |  |  |

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