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Real Estate Assets (Details) ft² in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) a ft² | Mar. 31, 2016 USD ($) ft² | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) a ft² | Jun. 30, 2015 USD ($)
Acquisitions [Abstract] |  |  |  |  |
Acquisition of development land (in acres) | a | 500 |  |  | 500 |
Dispositions [Abstract] |  |  |  |  |
Gains on disposition of discontinued operations | $ 0 |  | $ 0 | $ 414,496 | $ 0
Gains on disposition of property | $ 5,861 |  | $ 2,412 | $ 10,258 | $ 3,569
Rentable square feet of building (in sq feet) | ft² | 31,100 |  |  | 31,100 |
Nashville TN Land Acquisition (6/2016) [Member] |  |  |  |  |
Acquisitions [Abstract] |  |  |  |  |
Acquisition of development land (in acres) | a | 14 |  |  | 14 |
Acquisition purchase price | $ 9,100 |  |  |  |
Division Exit [Member] |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |
Purchase price of real estate |  | $ 660,000 |  |  |
Gains on disposition of discontinued operations |  | 414,500 |  |  |
Gains on disposition of property |  | 1,300 |  |  |
Disposition closing credits excluded |  | 4,800 |  |  |
Related Party Office Building Disposition [Member] |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |
Purchase price of real estate |  | 4,700 |  |  |
Gains on disposition of property |  | $ 1,100 |  |  |
Rentable square feet of building (in sq feet) | ft² |  | 32 |  |  |
Buyer occupancy percentage (in hundredths) |  | 79.00% |  |  |
Disposition closing credits excluded |  | $ 100 |  |  |
Building Dispositions [Member] |  |  |  |  |
Dispositions [Abstract] |  |  |  |  |
Purchase price of real estate | 14,200 | 6,400 |  |  |
Gains on disposition of property | $ 5,900 | 2,000 |  |  |
Disposition closing credits excluded |  | $ 500 |  |  |

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