Discontinued Operations (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011
REVENUES
Disposal Group Including Discontinued Operation Rental Revenue	$ 4,014,000		$ 21,850,000		$ 27,764,000		$ 140,541,000
Disposal Group, Including Discontinued Operation, Revenue	4,014,000		21,850,000		27,764,000		140,541,000
EXPENSES
Disposal Group Including Discontinued Operation Property And Maintenance	1,611,000	[1]	7,125,000	[1]	8,420,000	[1]	60,583,000	[1]
Disposal Group Including Discontinued Operation Real Estate Taxes And Insurance	309,000	[1]	2,125,000	[1]	2,010,000	[1]	10,995,000	[1]
Disposal Group Including Discontinued Operations Property Management	70,000		66,000		211,000		198,000
Disposal Group Including Discontinued Operation Depreciation	1,428,000	[1]	5,762,000	[1]	7,602,000	[1]	28,967,000	[1]
Disposal Group Including Discontinued Operation General And Administrative	31,000	[1]	2,000	[1]	71,000	[1]	49,000	[1]
Disposal Group, Including Discontinued Operation, Operating Expense	3,449,000	[1]	15,080,000	[1]	18,314,000	[1]	100,792,000	[1]
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	565,000		6,770,000		9,450,000		39,749,000
Disposal Group Including Discontinued Operation Interest And Other Income	34,000		46,000		79,000		150,000
Interest (2)
Expense Incurred, Net	(341,000)	[2]	(942,000)	[2]	(1,381,000)	[2]	(4,086,000)	[2]
Disposal Group Including Discontinued Operation Amortization Of Deferred Financing Costs	(9,000)	[2]	(71,000)	[2]	(65,000)	[2]	(869,000)	[2]
Discontinued Operation, Tax Effect of Discontinued Operation	(1,000)		93,000		48,000		31,000
Income Loss From Discontinued Operations	248,000		5,896,000		8,131,000		34,975,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	103,394,000		76,864,000		307,447,000		759,100,000
Discontinued operations, net	103,642,000		82,760,000		315,578,000		794,075,000
Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net									308,200,000
Disposal Group Including Discontinued Operation Mortgage Notes Payable									$ 36,600,000

[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.