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Nature Of Business (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Nature of Business [Line Items]
Percentage of Distribution of Ordinary Taxable Income				90.00%
Gain on sale of real estate				$ 0	$ 105,985	$ 22,144
Gain on sale of real estate	$ 59,400	$ 1,500	$ 30,300	91,107	570	0
Disposal Group, Including Discontinued Operation, Gain (Loss) on Disposal			$ 106,000	89,653	106,555	22,144
Real estate impairment		$ 5,900		$ 5,909	$ 0	$ 0
Ordinary income				78.00%	40.00%	62.00%
Return of capital				22.00%	52.00%	38.00%
Qualified dividends				0.00%	0.00%	0.00%
Unrecaptured Section 1250 gain				0.00%	8.00%	0.00%
Capital gain				0.00%	0.00%	0.00%
Dulles Station II [Member]
Nature of Business [Line Items]
Real estate impairment							$ 14,500
Taxable Reit Subsidiary [Member]
Nature of Business [Line Items]
Deferred Tax Assets, Net	0			$ 0	$ 0
Deferred Tax Liabilities	$ 700			700	600
Taxable Reit Subsidiary [Member] | Dulles Station II [Member]
Nature of Business [Line Items]
Deferred Tax Liabilities, Other							$ 5,700
Multifamily [Member] | Country Club Towers [Member]
Nature of Business [Line Items]
Gain on sale of real estate				30,277
Multifamily [Member] | 1225 First Street [Member]
Nature of Business [Line Items]
Gain on sale of real estate				0
Multifamily [Member] | Munson Hill Towers [Member]
Nature of Business [Line Items]
Gain on sale of real estate				$ 51,395
Retail [Member] | 5740 Columbia Road [Member]
Nature of Business [Line Items]
Gain on sale of real estate					570
Medical Office And Office Building [Member] | Medical Office Portfolio Transactions III & IV [Member]
Nature of Business [Line Items]
Gain on sale of real estate					$ 105,985
Medical Office And Office Building [Member] | Medical Office Portfolio Transactions I & II [Member]
Nature of Business [Line Items]
Gain on sale of real estate						$ 18,949
Office [Member] | Atrium Building [Member]
Nature of Business [Line Items]
Gain on sale of real estate						$ 3,195

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