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Real Estate Assets (Details) ft² in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) a ft² property | Jun. 30, 2016 USD ($) a | Mar. 31, 2016 USD ($) ft² | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) a ft² property | Sep. 30, 2015 USD ($)
Acquisitions [Abstract] |  |  |  |  |  |
Acquisition of development land (in acres) | a | 450 |  |  |  | 450 |
Dispositions [Abstract] |  |  |  |  |  |
Gains on disposition of property | $ 3,902 |  |  | $ 7,012 | $ 14,160 | $ 10,581
Gains on disposition of discontinued operations | $ 0 |  |  | $ 0 | $ 414,496 | $ 0
Rentable square feet of building (in sq feet) | ft² | 31,100 |  |  |  | 31,100 |
Raleigh NC Building Acquisition (09/2016) [Member] |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |
Rentable square feet of acquisition (in sqft) | ft² | 243 |  |  |  | 243 |
Acquisition purchase price | $ 76,900 |  |  |  |  |
Acquisition-related costs | 300 |  |  |  |  |
Fee Simple Title Pittsburgh, PA (09/2016) [Member] |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |
Acquisition purchase price | 18,500 |  |  |  |  |
Acquisition-related costs | $ 500 |  |  |  |  |
Number of buildings | property | 1 |  |  |  | 1 |
Raleigh NC Development Land (09/2016) [Member] |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |
Acquisition purchase price | $ 5,800 |  |  |  |  |
Nashville TN Land Acquisition (6/2016) [Member] |  |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |  |
Acquisition purchase price |  | $ 9,100 |  |  |  |
Acquisition of development land (in acres) | a |  | 14 |  |  |  |
2016 Dispositions [Member] |  |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |  |
Purchase price of real estate | 6,800 | $ 14,200 | $ 6,400 |  |  |
Gains on disposition of property | 3,900 | $ 5,900 | 2,000 |  |  |
Deferred gain on sale of property | $ 400 |  |  |  | $ 400 |
Disposition closing credits excluded |  |  | 500 |  |  |
Division Exit [Member] |  |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |  |
Purchase price of real estate |  |  | 660,000 |  |  |
Gains on disposition of property |  |  | 1,300 |  |  |
Disposition closing credits excluded |  |  | 4,800 |  |  |
Gains on disposition of discontinued operations |  |  | 414,500 |  |  |
Related Party Office Building Disposition [Member] |  |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |  |
Purchase price of real estate |  |  | 4,700 |  |  |
Gains on disposition of property |  |  | 1,100 |  |  |
Disposition closing credits excluded |  |  | $ 100 |  |  |
Rentable square feet of building (in sq feet) | ft² |  |  | 32 |  |  |
Buyer occupancy percentage (in hundredths) |  |  | 79.00% |  |  |

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