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Real Estate Investments - Summary of Land Parcels Sold (Parenthetical) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |
Provision for impairment on assets held for sale |  |  |  |  | 300 |  |  |
Land [Member] |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  |  | 9,232 | [1] | 3,019 | [2] | $ 1,184 | [3]
Land [Member] | Greenhills Land [Member] |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain (Loss) on Sale | [1],[4] |  | $ 0 |  |  |  |  |
Provision for impairment on assets held for sale |  | $ 300 |  |  |  |  |  |
Land [Member] | Two Christina Centre [Member] |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain (Loss) on Sale | [2],[5] |  |  |  | $ 0 |  |  |
Provision for impairment on assets held for sale |  | $ 300 |  |  |  |  |  |
[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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