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) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Jan. 01, 2014 USD ($) a ft² bldg	Dec. 01, 2013 USD ($) a ft² bldg	Nov. 01, 2013 USD ($) a ft² bldg
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]
Gain on property dispositions									$ 0	$ 46,631	$ 95,384
Income from discontinued operations	$ 0	$ 0	$ 0	$ 0	$ 306	$ 133	$ 296	$ 47,846	0	48,581	121,839
Discontinued Operations [Member]
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]
Revenues									0	4,728	113,586
Operating expenses									0	(2,258)	(41,875)
Interest and other income									0	37	213
Interest expense									0	(557)	(15,903)
Depreciation and amortization									0	0	(29,566)
Income before property dispositions									0	1,950	26,455
Gain on property dispositions									0	46,631	95,384
Income from discontinued operations									$ 0	$ 48,581	121,839
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 (unaudited) \| ft²												1,400,000
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 buildings \| bldg												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 (unaudited) \| ft²												37,000
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 (unaudited) \| a												19
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, 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 buildings \| bldg														97
Leaseable square feet (unaudited) \| ft²														6,600,000
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 (unaudited) \| a														159
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]
Number of Real Estate Settlements													2
Sales proceeds													$ 367,700
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 buildings \| bldg													49
Leaseable square feet (unaudited) \| ft²													4,000,000
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 (unaudited) \| a													140
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
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 buildings \| bldg												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 (unaudited) \| ft²												1,200,000
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 buildings \| bldg												1
Other Properties [Member] \| Building and Building Improvements [Member] \| Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales proceeds											$ 136,700