Discontinued Operations (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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations	$ 0	$ 6,938	$ 0	$ 20,002
Fees to Vornado	1,084	1,146	3,068	3,231
Kings Plaza Regional Shopping Center [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues	0	17,518	0	50,601
Total expenses	0	10,580	0	30,599
Income from discontinued operations	0	6,938	0	20,002
Fees to Vornado		$ 433		$ 1,310