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Real Estate Investments - Summary of Land Parcels Sold (Details) $ in Thousands | 12 Months Ended |
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Dec. 31, 2016 USD ($) a Parcel | Dec. 31, 2015 USD ($) a Parcel | Dec. 31, 2014 USD ($) a Parcel | Jan. 15, 2016 Parcel
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from the sale of properties |  | $ 784,331 |  | $ 247,228 |  | $ 118,855 |  |
Gain (Loss) on Sale |  | $ 116,983 |  | $ 20,496 |  | $ 4,901 |  |
Greenhills Land [Member] |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of Parcels | Parcel |  |  |  |  |  |  |  | 120
Land [Member] |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of Parcels | Parcel |  | 3 |  | 4 |  | 2 |  |
Acreage of land | a |  | 122.9 |  | 14.7 |  | 22.1 |  |
Sales Price |  | $ 14,938 |  | $ 22,300 |  | $ 5,120 |  |
Proceeds from the sale of properties |  | 14,532 |  | 21,088 |  | 4,855 |  |
Gain (Loss) on Sale |  | $ 9,232 | [1] | $ 3,019 | [2] | $ 1,184 | [3] |
Land [Member] | Oakland Lot B [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 |  | 0.9 |  |  |  |  |  |
Sales Price |  | $ 13,750 |  |  |  |  |  |
Proceeds from the sale of properties |  | 13,411 |  |  |  |  |  |
Gain (Loss) on Sale | [1] | $ 9,039 |  |  |  |  |  |
Land [Member] | Highlands 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 |  | 2.0 |  |  |  |  |  |
Sales Price |  | $ 288 |  |  |  |  |  |
Proceeds from the sale of properties |  | 284 |  |  |  |  |  |
Gain (Loss) on Sale | [1] | $ 193 |  |  |  |  |  |
Land [Member] | Greenhills 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 |  | 120.0 |  |  |  |  |  |
Sales Price |  | $ 900 |  |  |  |  |  |
Proceeds from the sale of properties |  | 837 |  |  |  |  |  |
Gain (Loss) on Sale | [1],[4] | $ 0 |  |  |  |  |  |
Land [Member] | Two Christina Centre [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 |  |  |  |
Proceeds from the sale of properties |  |  |  | 5,986 |  |  |  |
Gain (Loss) on Sale | [2],[5] |  |  | $ 0 |  |  |  |
Land [Member] | A7000 Midlantic [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 |  |  |  |
Proceeds from the sale of properties |  |  |  | 1,742 |  |  |  |
Gain (Loss) on Sale | [2] |  |  | $ (169) |  |  |  |
Land [Member] | 11305 Four Points Drive (Four Points Centre) [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 |  |  |  |
Proceeds from the sale of properties |  |  |  | 2,344 |  |  |  |
Gain (Loss) on Sale | [2] |  |  | $ 71 |  |  |  |
Land [Member] | Two Kaiser Plaza [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 |  |  |  |
Proceeds from the sale of properties |  |  |  | 11,016 |  |  |  |
Gain (Loss) on Sale | [2] |  |  | $ 3,117 |  |  |  |
Land [Member] | West Point II 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 |  |
Proceeds from the sale of properties |  |  |  |  |  | 1,505 |  |
Gain (Loss) on Sale | [3] |  |  |  |  | $ 12 |  |
Land [Member] | Rob Roy - 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 |  |
Proceeds from the sale of properties |  |  |  |  |  | 3,350 |  |
Gain (Loss) on Sale | [3] |  |  |  |  | $ 1,172 |  |
[1] | Gain on Sale is net of closing and other transaction related costs.
[2] | Gain/(Loss) on sale includes closing and other transaction related costs.
[3] | Gain/(Loss) on Sale is net of closing and other transaction related costs.
[4] | The carrying value of the land exceeded the fair value less the anticipated costs of sale as of December 31, 2015, therefore the Company recognized an impairment loss of $0.3 million during the three-month period ended December 31, 2015. There was no gain or loss recognized on the sale during 2016.
[5] | 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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