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Real Estate Investments - Summary of Office Properties Sold (Details) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Feb. 04, 2016 property | Mar. 31, 2016 USD ($) ft² property | Mar. 31, 2015 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Net Proceeds on Sale |  |  | $ 704,911 |  | $ 26,778
Gain (Loss) on Sale |  |  | $ 115,456 |  | $ 9,019
Office Building [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Properties Sold | property |  |  | 59 |  |
Rentable Square Feet | ft² |  |  | 4,787,475 |  |
Sales Price |  |  | $ 752,100 |  |
Net Proceeds on Sale |  |  | 704,121 |  |
Gain (Loss) on Sale | [1] |  | $ 115,456 |  |
Office Building [Member] | 2970 Market Street (Cira Square) [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Properties Sold | property |  |  | 1 |  |
Rentable Square Feet | ft² |  |  | 862,692 |  |
Sales Price |  |  | $ 354,000 |  |
Net Proceeds on Sale |  |  | 350,150 |  |
Gain (Loss) on Sale | [1] |  | $ 115,828 |  |
Office Building [Member] | Och Ziff Portfolio [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Properties Sold | property |  | 58 | 58 | [2] |
Rentable Square Feet | ft² | [2] |  | 3,924,783 |  |
Sales Price | [2] |  | $ 398,100 |  |
Net Proceeds on Sale | [2] |  | 353,971 |  |
Gain (Loss) on Sale | [1],[2],[3] |  | $ (372) |  |
[1] | Gain/(Loss) on Sale is net of closing and other transaction related costs.
[2] | Exhibit 99.2 to Form 8-K filed on February 10, 2016 contains a complete list of the 58 properties. See also Note 4, "Investment in Unconsolidated Real Estate Ventures," for further details of the transactions.
[3] | During the fourth quarter of 2015, the Company recognized an impairment loss totaling approximately $45.4 million on the properties. The loss on sale represents additional closing costs that were not known at settlement.

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