For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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Carrying amount as of the balance sheet date of obligations due all related parties.

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Investments in Unconsolidated Joint Ventures (Liberty/Comcast 1701 JFK Boulevard, LP) (Details) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) ft²	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Liberty Comcast 1701 JFK Boulevard, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%
Philadelphia [Member] \| Liberty Comcast 1701 JFK Boulevard, LP [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%
Philadelphia [Member] \| Equity Method Investee [Member] \| Liberty Comcast 1701 JFK Boulevard, LP [Member]
Schedule of Equity Method Investments [Line Items]
Management fees revenue	$ 2,700	$ 2,700	$ 2,400
Philadelphia [Member] \| Building and Building Improvements [Member] \| Liberty Comcast 1701 JFK Boulevard, LP [Member]
Schedule of Equity Method Investments [Line Items]
Leaseable square feet \| ft²	1,250
Philadelphia [Member] \| Investments in and advances to unconsolidated joint ventures [Member] \| Equity Method Investee [Member] \| Liberty Comcast 1701 JFK Boulevard, LP [Member]
Schedule of Equity Method Investments [Line Items]
Due to related parties	$ 59	59
Philadelphia [Member] \| Prepaid Expenses and Other Current Assets [Member] \| Equity Method Investee [Member] \| Liberty Comcast 1701 JFK Boulevard, LP [Member]
Schedule of Equity Method Investments [Line Items]
Due from related parties	$ 401	$ 407