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Real Estate Assets Real Estate Assets (Details) ft² in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) a ft² property parcel | Dec. 31, 2017 USD ($) property | Dec. 31, 2016 USD ($) a ft² property
Acquisitions [Abstract] |  |  |
Undeveloped land suitable for future development (in acres) | a | 350 |  |
Acquisition-related costs |  |  |
Dispositions [Abstract] |  |  |
Rentable square feet of commercial real estate (in square feet) | ft² | 30,500 |  |
Gains on disposition of discontinued operations | $ 0 | 0 | 414,496
Gains on disposition of property | 37,638 | 54,157 | 14,807
Impairments [Abstract] |  |  |
Impairments of real estate assets | $ 423 | 1,445 | $ 0
Nashville TN Land Acquisition (03/2018) [Member] |  |  |
Acquisitions [Abstract] |  |  |
Number of development parcels acquired (in parcels) | parcel | 2 |  |
Undeveloped land suitable for future development (in acres) | a | 9 |  |
Acquisition purchase price | $ 50,600 |  |
Fee Simple Title Raleigh, NC (03/2017) [Member] |  |  |
Acquisitions [Abstract] |  |  |
Acquisition purchase price |  | $ 2,600 |
Raleigh NC Building Acquisition (09/2016) [Member] |  |  |
Acquisitions [Abstract] |  |  |
Net rentable square feet of acquisition (in sqft) | ft² |  |  | 243
Acquisition purchase price |  |  | $ 76,900
Acquisition-related costs |  |  | $ 300
Fee Simple Title Pittsburgh, PA (09/2016) [Member] |  |  |
Acquisitions [Abstract] |  |  |
Number of office properties | property |  |  | 1
Acquisition purchase price |  |  | $ 18,500
Acquisition-related costs |  |  | 500
Raleigh NC Development Land (09/2016) [Member] |  |  |
Acquisitions [Abstract] |  |  |
Acquisition purchase price |  |  | $ 5,800
Nashville TN Land Acquisition (6/2016) [Member] |  |  |
Acquisitions [Abstract] |  |  |
Undeveloped land suitable for future development (in acres) | a |  |  | 14
Acquisition purchase price |  |  | $ 9,100
2018 Dispositions [Member] |  |  |
Dispositions [Abstract] |  |  |
Number of buildings sold | property | 3 |  |
Purchase price of real estate | $ 90,600 |  |
Gains on disposition of property | 37,600 |  |
2017 Dispositions [Member] |  |  |
Dispositions [Abstract] |  |  |
Number of buildings sold | property |  | 15 |
Purchase price of real estate |  | $ 135,600 |
Closing credits excluded for unfunded building and/or tenant improvements |  | 3,700 |
Gains on disposition of property |  | 54,200 |
2016 Dispositions [Member] |  |  |
Dispositions [Abstract] |  |  |
Number of buildings sold | property |  |  | 2
Purchase price of real estate |  |  | $ 31,100
Closing credits excluded for unfunded building and/or tenant improvements |  |  | 500
Gains on disposition of property |  |  | 12,400
Additional purchase price consideration |  |  | 400
Division Exit [Member] |  |  |
Dispositions [Abstract] |  |  |
Purchase price of real estate |  |  | 660,000
Closing credits excluded for unfunded building and/or tenant improvements |  |  | 4,800
Gains on disposition of discontinued operations |  |  | 414,500
Gains on disposition of property |  |  | $ 1,300
Related Party Office Building Disposition [Member] |  |  |
Dispositions [Abstract] |  |  |
Rentable square feet of commercial real estate (in square feet) | ft² |  |  | 32
Purchase price of real estate |  |  | $ 4,700
Closing credits excluded for unfunded building and/or tenant improvements |  |  | 100
Gains on disposition of property |  |  | $ 1,100
Buyer occupancy percentage (in hundredths) |  |  | 79.00%
2018 Impairments [Member] |  |  |
Impairments [Abstract] |  |  |
Impairments of real estate assets | $ 400 |  |
2017 Impairments [Member] |  |  |
Impairments [Abstract] |  |  |
Impairments of real estate assets |  | $ 1,400 |

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