Investment In Unconsolidated Joint Ventures (Income Or Loss From Unconsolidated Joint Ventures) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Investments in Unconsolidated Joint Ventures [Line Items]
Income (Loss) from Unconsolidated Joint Ventures	$ 227	$ 237	$ (21)	$ (79)
Loss from Remeasurement of Investment in Unconsolidated Joint Venture		(1,668)		(1,892)
Income (Loss) from Unconsolidated Joint Venture Investments	227	(1,431)	(21)	(1,971)
SB Partners, LLC [Member]
Investments in Unconsolidated Joint Ventures [Line Items]
Income (Loss) from Unconsolidated Joint Ventures	188	200	190	105
Hiren Boston, LLC [Member]
Investments in Unconsolidated Joint Ventures [Line Items]
Income (Loss) from Unconsolidated Joint Ventures	141	145	90	249
Mystic Partners, LLC [Member]
Investments in Unconsolidated Joint Ventures [Line Items]
Income (Loss) from Unconsolidated Joint Ventures	(102)	(108)	(301)	(319)
Metro 29th Street Associates, LLC [Member]
Investments in Unconsolidated Joint Ventures [Line Items]
Income (Loss) from Unconsolidated Joint Ventures				$ (114)