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Real Estate Investments - Summary of Office Properties Sold (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended
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Feb. 04, 2016 property | Jun. 30, 2016 USD ($) ft² | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) ft² property | Jun. 30, 2015 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Net Proceeds on Sale |  |  |  |  | $ 748,395 |  | $ 80,268
Gain (Loss) on Sale |  |  | $ (727) | $ 1,571 | $ 114,729 |  | $ 10,590
Office Building [Member] |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  | 61 |  |
Rentable Square Feet | ft² |  |  | 4,984,700 |  | 4,984,700 |  |
Sales Price |  |  | $ 796,600 |  | $ 796,600 |  |
Net Proceeds on Sale |  |  |  |  | 747,533 |  |
Gain (Loss) on Sale | [1] |  |  |  | $ 114,704 |  |
Office Building [Member] | 196/198 Van Buren Street (Herndon Metro Plaza I&II) [Member] |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  | 2 |  |
Rentable Square Feet | ft² |  |  | 197,225 |  | 197,225 |  |
Sales Price |  |  | $ 44,500 |  | $ 44,500 |  |
Net Proceeds on Sale |  |  |  |  | 43,412 |  |
Gain (Loss) on Sale | [1],[2] |  |  |  | $ (752) |  |
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 |  | 862,692 |  |
Sales Price |  |  | $ 354,000 |  | $ 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 | [3] |
Rentable Square Feet | ft² | [3] |  | 3,924,783 |  | 3,924,783 |  |
Sales Price | [3] |  | $ 398,100 |  | $ 398,100 |  |
Net Proceeds on Sale | [3] |  |  |  | 353,971 |  |
Gain (Loss) on Sale | [1],[3],[4] |  |  |  | $ (372) |  |
[1] | Gain/(Loss) on Sale is net of closing and other transaction related costs.
[2] | During the three-month period ended March 31, 2016, the Company recognized an impairment loss totaling approximately $7.4 million on the properties. The loss on sale represents additional closing costs recognized at settlement.
[3] | Exhibit 99.2 to the Company’s Current Report on Form 8-K filed on February 10, 2016 contains a complete list of the 58 properties disposed of in the transactions with Och-Ziff Capital Management. See Note 4, "Investment in Unconsolidated Real Estate Ventures," for further details of the transactions.
[4] | During the three-month period ended December 31, 2015, the Company recognized an impairment loss totaling approximately $45.4 million. The loss on sale represents additional closing costs recognized at settlement.

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