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Real Estate Assets Real Estate Assets (Details) ft² in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) a ft² property | Dec. 31, 2016 USD ($) a ft² property | Dec. 31, 2015 USD ($) ft² property
Acquisitions [Abstract] |  |  |
Undeveloped land suitable for future development (in acres) | a | 400 |  |
Asset acquisition, contingent consideration liability | $ 750 | $ 0 | $ 900
Acquisition-related costs |  |  | 1,000
Dispositions [Abstract] |  |  |
Rentable square feet of commercial real estate (in square feet) | ft² | 30,700 |  |
Gains on disposition of discontinued operations | $ 0 | 414,496 | 0
Gains on disposition of property | 54,157 | 14,807 | 11,444
Impairments [Abstract] |  |  |
Impairments of real estate assets | 1,445 | $ 0 | $ 0
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 |
Tampa, FL Building Acquisition (09/2015) [Member] |  |  |
Acquisitions [Abstract] |  |  |
Net rentable square feet of acquisition (in sqft) | ft² |  |  | 528
Acquisition purchase price |  |  | $ 113,500
Tampa, FL Land Acquisition (09/2015) [Member] |  |  |
Acquisitions [Abstract] |  |  |
Acquisition purchase price |  |  | $ 2,200
Atlanta, GA Building Acquisition (09/2015) [Member] |  |  |
Acquisitions [Abstract] |  |  |
Number of office properties | property |  |  | 2
Net rentable square feet of acquisition (in sqft) | ft² |  |  | 896
Acquisition purchase price |  |  | $ 290,300
Atlanta, GA Land Acquisition [Member] (6/2015) [Member] |  |  |
Acquisitions [Abstract] |  |  |
Acquisition purchase price |  |  | 5,200
Asset acquisition, contingent consideration liability |  |  | $ 900
Orlando, FL Building Acquisition [Member] (6/2015) [Member] |  |  |
Acquisitions [Abstract] |  |  |
Net rentable square feet of acquisition (in sqft) | ft² |  |  | 168
Percentage of partner's interest in asset acquired (in hundredths) |  |  | 77.20%
Fair value of debt assumed from the acquisition |  |  | $ 19,300
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% |
2015 Dispositions [Member] |  |  |
Dispositions [Abstract] |  |  |
Number of buildings sold | property |  |  | 3
Purchase price of real estate |  |  | $ 27,800
Gains on disposition of property |  |  | 9,200
Income tax expense netted against gain |  |  | $ 500
2017 Impairments [Member] |  |  |
Impairments [Abstract] |  |  |
Impairments of real estate assets | $ 1,400 |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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