Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011		Dec. 31, 2011
REVENUES
Disposal Group Including Discontinued Operation Rental Revenue	$ 3,198		$ 41,757		$ 10,131		$ 105,762
Disposal Group, Including Discontinued Operation, Revenue	3,198		41,757		10,131		105,762
EXPENSES
Disposal Group Including Discontinued Operation Property And Maintenance	1,376	[1]	22,471	[1]	3,197	[1]	49,951	[1]
Disposal Group Including Discontinued Operation Real Estate Taxes And Insurance	325	[1]	2,887	[1]	920	[1]	7,581	[1]
Disposal Group Including Discontinued Operation Depreciation	660	[1]	7,115	[1]	2,027	[1]	19,039	[1]
Disposal Group Including Discontinued Operation General And Administrative	36	[1]	36	[1]	40	[1]	47	[1]
Disposal Group, Including Discontinued Operation, Operating Expense	2,397	[1]	32,509	[1]	6,184	[1]	76,618	[1]
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	801		9,248		3,947		29,144
Disposal Group Including Discontinued Operation Interest And Other Income	18		96		43		101
Disposal Group Including Discontinued Operation Other Expenses	0		4		0		0
Interest (2)
Expense Incurred, Net	(288)	[2]	(605)	[2]	(369)	[2]	(1,209)	[2]
Disposal Group Including Discontinued Operation Amortization Of Deferred Financing Costs	0	[2]	(578)	[2]	0	[2]	(647)	[2]
Discontinued Operation, Tax Effect of Discontinued Operation	129		(20)		49		(62)
Income Loss From Discontinued Operations	660		8,145		3,670		27,327
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	71,097		558,482		204,053		682,236
Discontinued operations, net	71,757		566,627		207,723		709,563
Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net									130,632
Disposal Group Including Discontinued Operation Mortgage Notes Payable									$ 3,227

[1] Includes expenses paid in the current period for properties sold or held for sale in prior periods related to the Company’s period of ownership.

[2] Includes only interest expense specific to secured mortgage notes payable for properties sold and/or held for sale.