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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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No definition available.

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The aggregate revenue from real estate operations during the reporting period.

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Held For Sale Assets (Summary Of Operations Of The Property Held For Sale) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Held For Sale Assets [Line Items]
Rental revenues	$ 18,747us-gaap_RealEstateRevenueNet	$ 17,714us-gaap_RealEstateRevenueNet	$ 16,610us-gaap_RealEstateRevenueNet	$ 15,804us-gaap_RealEstateRevenueNet	$ 13,169us-gaap_RealEstateRevenueNet	$ 11,516us-gaap_RealEstateRevenueNet	$ 10,815us-gaap_RealEstateRevenueNet	$ 10,029us-gaap_RealEstateRevenueNet	$ 68,875us-gaap_RealEstateRevenueNet	$ 45,529us-gaap_RealEstateRevenueNet	$ 29,335us-gaap_RealEstateRevenueNet
Tenant expense reimbursements									14,747us-gaap_TenantReimbursements	9,658us-gaap_TenantReimbursements	6,278us-gaap_TenantReimbursements
Property operating expenses	(14,105)us-gaap_OperatingExpenses	(12,806)us-gaap_OperatingExpenses	(12,230)us-gaap_OperatingExpenses	(12,426)us-gaap_OperatingExpenses	(11,006)us-gaap_OperatingExpenses	(9,131)us-gaap_OperatingExpenses	(8,906)us-gaap_OperatingExpenses	(7,930)us-gaap_OperatingExpenses	(51,567)us-gaap_OperatingExpenses	(36,973)us-gaap_OperatingExpenses	(25,931)us-gaap_OperatingExpenses
Depreciation and amortization									(19,170)us-gaap_DepreciationAndAmortization	(12,481)us-gaap_DepreciationAndAmortization	(8,728)us-gaap_DepreciationAndAmortization
Income (loss) from continuing operations	2,774	3,438	2,721	1,785	562	933	372	584	10,718	2,451	(2,031)
Washington DC and Baltimore [Member]
Held For Sale Assets [Line Items]
Rental revenues									594	594	127
Tenant expense reimbursements									123	109	19
Property operating expenses									(123)	(116)	(23)
Depreciation and amortization									(261)	(313)	(73)
Income (loss) from continuing operations									$ 333	$ 274	$ 50