Number of Real Estate Settlements

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Area of land held.

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Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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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 of depreciation and amortization expense attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of interest expense attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of operating expense attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of operating income (loss) attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of other income attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

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Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Net rentable area for properties owned.

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The number of real estate properties owned as of the balance sheet date.

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Accounting for the Impairment or Disposal of Long-Lived Assets (Discontinued Operations) (Details) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jan. 31, 2014 USD ($) a ft² properties	Dec. 31, 2013 USD ($) a ft² properties settlement	Nov. 30, 2013 USD ($) a ft² properties
Discontinued Operation
Gain on property dispositions			$ 46,631
Net income	$ 0	$ 0	48,581
Discontinued Operations [Member]
Discontinued Operation
Revenues			4,728
Operating expenses			(2,258)
Interest and other income			37
Interest expense			(557)
Depreciation and amortization			0
Income before property dispositions			1,950
Gain on property dispositions			46,631
Net income			$ 48,581
Building and Building Improvements [Member] \| Maryland [Member] \| Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Leaseable square feet \| ft²				1,400
Building and Building Improvements [Member] \| New Jersey [Member] \| Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties \| properties				24
Building and Building Improvements [Member] \| Southeastern PA [Member] \| Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Leaseable square feet \| ft²				37
Land and Land Improvements [Member] \| Maryland [Member] \| Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acres of developable land \| a				19
Portfolio Sale, Total [Member] \| Building and Building Improvements [Member] \| Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties \| properties						97
Leaseable square feet \| ft²						6,600
Portfolio Sale, Total [Member] \| Land and Land Improvements [Member] \| Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acres of developable land \| a						159
Portfolio Sale, Total [Member] \| Land, Buildings and Improvements [Member] \| Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales proceeds						$ 697,300
Portfolio Sale, first settlement [Member] \| Building and Building Improvements [Member] \| Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties \| properties					49
Leaseable square feet \| ft²					4,000
Portfolio Sale, first settlement [Member] \| Land and Land Improvements [Member] \| Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acres of developable land \| a					140
Portfolio Sale, first settlement [Member] \| Land, Buildings and Improvements [Member] \| Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales proceeds					$ 367,700
Number of real estate settlements \| settlement					2
Portfolio Sale, Second Settlement [Member] \| Building and Building Improvements [Member] \| Maryland [Member] \| Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties \| properties				23
Portfolio Sale, Second Settlement [Member] \| Building and Building Improvements [Member] \| New Jersey [Member] \| Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Leaseable square feet \| ft²				1,200
Portfolio Sale, Second Settlement [Member] \| Building and Building Improvements [Member] \| Southeastern PA [Member] \| Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties \| properties				1
Portfolio Sale, Second Settlement [Member] \| Land, Buildings and Improvements [Member] \| Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales proceeds				$ 329,600