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Real Estate Investments - Dispositions (Textual) (Details)	3 Months Ended				6 Months Ended
	Jun. 30, 2016 USD ($) property	Mar. 31, 2016 USD ($) property	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) property	Jun. 30, 2015 USD ($)	Jan. 15, 2015 USD ($) Parcel
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain (Loss) on Sale	$ (727,000)			$ 1,571,000	$ 114,729,000	$ 10,590,000
Number of Properties | property	120				120
Pennsylvania Suburbs [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of Parcels | Parcel							120
Sales Price							$ 900,000
Provision for impairment on assets held for sale			$ 300,000
Gain (Loss) on Sale		$ 0
Metropolitan DC [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of Properties | property	1	2			1
Impairment of properties held for use	$ 3,900,000	$ 7,400,000
Carrying value of real estate prior to impairment	37,400,000	51,900,000			$ 37,400,000
Aggregate carrying value	$ 33,500,000	$ 44,500,000			$ 33,500,000
Impairment Hold Period	10 years	10 years
Residual Capitalization Rates	7.75%	7.00%
Discount Rates	8.25%	7.00%

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Carrying value of real estate prior to impairment.

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Number of parcels of land.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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