Unconsolidated Joint Ventures (Details)	3 Months Ended
Mar. 31, 2016 USD ($) ft² bldg	Mar. 31, 2015 USD ($)
Liberty Washington LP [Abstract]
Gain on sale of properties	$ 20,521,000	$ 2,271,000
Liberty Washington, LP [Member] \| Northern Virginia [Member]
Liberty Washington LP [Abstract]
Equity Method Investment, Ownership Percentage	25.00%
Liberty Washington, LP [Member] \| Northern Virginia [Member] \| Mortgages [Member]
Liberty Washington LP [Abstract]
Mortgage value in default	$ 46,400,000
Liberty Washington, LP [Member] \| Operating Segments [Member] \| Disposal Group, Not Discontinued Operations [Member] \| Joint venture, 2016 sales [Member] \| Northern Virginia [Member] \| Building and Building Improvements [Member]
Liberty Washington LP [Abstract]
Net Rentable Area \| ft²	601,000
Number of Real Estate Properties \| bldg	3
Proceeds from Sale of Property	$ 80,500,000
Liberty Washington, LP [Member] \| Operating Segments [Member] \| Disposal Group, Not Discontinued Operations [Member] \| Joint venture, 2016 deed in lieu transfer [Member] \| Northern Virginia [Member] \| Building and Building Improvements [Member]
Liberty Washington LP [Abstract]
Net Rentable Area \| ft²	449,000
Number of Real Estate Properties \| bldg	4
Liberty Washington, LP [Member] \| Operating Segments [Member] \| Disposal Group, Not Discontinued Operations [Member] \| Mortgages [Member] \| Joint venture, 2016 deed in lieu transfer [Member] \| Northern Virginia [Member] \| Building and Building Improvements [Member]
Liberty Washington LP [Abstract]
Extinguishment of Debt, Amount	$ 66,100,000
General Partner [Member] \| Gain on equity method investments [Member] \| Liberty Washington, LP [Member] \| Operating Segments [Member] \| Disposal Group, Not Discontinued Operations [Member] \| Joint venture, 2016 deed in lieu transfer [Member] \| Northern Virginia [Member] \| Building and Building Improvements [Member]
Liberty Washington LP [Abstract]
Gain on sale of properties	1,800,000
General Partner [Member] \| Gain on equity method investments [Member] \| Liberty Washington, LP [Member] \| Operating Segments [Member] \| Disposal Group, Not Discontinued Operations [Member] \| Mortgages [Member] \| Joint venture, 2016 deed in lieu transfer [Member] \| Northern Virginia [Member] \| Building and Building Improvements [Member]
Liberty Washington LP [Abstract]
Gain on extinguishment of debt	$ 912,000

Liberty Washington LP [Abstract]

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Amount of outstanding long-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured.

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Gross amount of debt extinguished.

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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Net rentable area for properties owned.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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