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Real Estate Investments - Summary of Land Parcels Sold (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) a Parcel | Dec. 31, 2014 USD ($) a Parcel | Dec. 31, 2013 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net Proceeds on Sale |  | $ 247,228 |  | $ 118,855 |  | $ 423,480
Gain (Loss) on Sale |  | $ 20,496 |  | $ 4,901 |  | $ 0
Land [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Parcels | Parcel |  | 4 |  | 2 |  |
Acreage of Land | a |  | 14.7 |  | 22.1 |  |
Sales Price |  | $ 22,300 |  | $ 5,120 |  |
Net Proceeds on Sale |  | 21,088 |  | 4,855 |  |
Gain (Loss) on Sale |  | $ 3,019 | [1] | $ 1,184 | [2] |
Two Christina Centre [Member] | Land [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Parcels | Parcel |  | 1 |  |  |  |
Acreage of Land | a |  | 1.6 |  |  |  |
Sales Price |  | $ 6,500 |  |  |  |
Net Proceeds on Sale |  | 5,986 |  |  |  |
Gain (Loss) on Sale | [1],[3] | $ 0 |  |  |  |
A7000 Midlantic [Member] | Land [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Parcels | Parcel |  | 1 |  |  |  |
Acreage of Land | a |  | 3.5 |  |  |  |
Sales Price |  | $ 2,200 |  |  |  |
Net Proceeds on Sale |  | 1,742 |  |  |  |
Gain (Loss) on Sale | [1] | $ (169) |  |  |  |
Four Points Centre [Member] | Land [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Parcels | Parcel |  | 1 |  |  |  |
Acreage of Land | a |  | 8.6 |  |  |  |
Sales Price |  | $ 2,500 |  |  |  |
Net Proceeds on Sale |  | 2,344 |  |  |  |
Gain (Loss) on Sale | [1] | $ 71 |  |  |  |
Two Kaiser Plaza [Member] | Land [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Parcels | Parcel |  | 1 |  |  |  |
Acreage of Land | a |  | 1.0 |  |  |  |
Sales Price |  | $ 11,100 |  |  |  |
Net Proceeds on Sale |  | 11,016 |  |  |  |
Gain (Loss) on Sale | [1] | $ 3,117 |  |  |  |
West Point II Land [Member] | Land [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Parcels | Parcel |  |  |  | 1 |  |
Acreage of Land | a |  |  |  | 5.3 |  |
Sales Price |  |  |  | $ 1,600 |  |
Net Proceeds on Sale |  |  |  | 1,505 |  |
Gain (Loss) on Sale | [2] |  |  | $ 12 |  |
Rob Roy - Land [Member] | Land [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Parcels | Parcel |  |  |  | 1 |  |
Acreage of Land | a |  |  |  | 16.8 |  |
Sales Price |  |  |  | $ 3,520 |  |
Net Proceeds on Sale |  |  |  | 3,350 |  |
Gain (Loss) on Sale | [2] |  |  | $ 1,172 |  |
[1] | Gain/(Loss) on sale includes closing and other transaction related costs.
[2] | Gain/(Loss) on Sale is net of closing and other transaction related costs.
[3] | The Company recorded an impairment loss of $0.3 million for Two Christina Centre during the fourth quarter of 2015. As such, there was no gain/(loss) at disposition for this land parcel.

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