ACQUISITION AND DISPOSITION OF PROPERTIES AND DISCONTINUED OPERATIONS Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
ASSETS
Net real estate	$ 19,400				$ 352,729				$ 19,400	$ 352,729
Rents receivable, net	917				3,326				917	3,326
Deferred charges, net	612				6,246				612	6,246
Prepaid expenses and other assets	1,132				1,582				1,132	1,582
Total assets of discontinued operations	22,061				363,883				22,061	363,883
LIABILITIES
Disposal Group Including Discontinued Operations, Mortgages Payable	9,208				140,171				9,208	140,171
Accounts payable and accrued expenses	3,125				3,078				3,125	3,078
Other liabilities	765				1,920				765	1,920
Total liabilities of discontinued operations	13,098				145,169				13,098	145,169
STATEMENTS OF OPERATIONS
Total revenues									37,464	40,392	36,568
Total expenses									26,744	31,640	33,048
Operating income									10,720	8,752	3,520
Impairment of asset									0	(6,925)	0
Loss on debt extinguishment									(2,541)	0	0
Gain on sale of property									71,203	46,830	0
Income from discontinued operations									79,382	48,657	3,520
Income from discontinued operations attributable to noncontrolling interests									(63,710)	(15,815)	(1,696)
Income from discontinued operations attributable to Common Shareholders	$ 12,594	$ 1,343	$ 1,162	$ 573	$ 4,425	$ 497	$ 26,393	$ 1,526	$ 15,672	$ 32,842	$ 1,824