Dispositions (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended						0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Retail Green Acres Mall [Member]	Mar. 31, 2013 Retail Green Acres Mall [Member]	Mar. 31, 2014 Other Real Estate [Member]	Mar. 31, 2013 Other Real Estate [Member]	Mar. 31, 2014 Retail Properties Segment [Member]	Dec. 31, 2013 Retail Properties Segment [Member]	Mar. 17, 2014 Retail Properties Segment [Member] Retail CA Los Angeles Beverly Connection [Member]	Mar. 31, 2014 Retail Properties Segment [Member] Retail CA Los Angeles Beverly Connection [Member]	Dec. 31, 2013 Retail Properties Segment [Member] Retail CA Los Angeles Beverly Connection [Member]	Mar. 31, 2014 Retail Properties Segment [Member] Retail NY Hicksville (Broadway Mall) [Member]	Dec. 31, 2013 Retail Properties Segment [Member] Retail NY Hicksville (Broadway Mall) [Member]
Disposal Group Including Discontinued Operation Unclassified Balance Sheet Disclosures Abstract
Assets related to discontinued operations	$ 207,575		$ 314,622					$ 207,575	$ 314,622		$ 207,575	$ 208,458	$ 0	$ 106,164
Liabilities related to discontinued operations	0		13,950					0	13,950		0	0	0	13,950
Discontinued Operation, Income (Loss) from Discontinued Operations Disclosure [Abstract]
Total revenues	8,283	25,990
Total expenses	5,550	20,043
Income from discontinued operations before gain on sale of real estate	2,733	5,947
Impairment losses	(842)	(1,514)
Net gains on sale of real estate				0	202,275	0	54			40,000
Income from discontinued operations	$ 1,891	$ 206,762