Discontinued Operations (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
REVENUES
Disposal Group Including Discontinued Operation Rental Revenue	$ 47,342,000	$ 84,142,000
Disposal Group, Including Discontinued Operation, Revenue	47,342,000	84,142,000
EXPENSES
Disposal Group Including Discontinued Operation Property And Maintenance	11,870,000	19,849,000
Disposal Group Including Discontinued Operation Real Estate Taxes And Insurance	5,042,000	3,797,000
Disposal Group Including Discontinued Operations Property Management	1,000	70,000
Disposal Group Including Discontinued Operation Depreciation	14,766,000	26,862,000
Disposal Group Including Discontinued Operation General And Administrative	7,000	4,000
Disposal Group, Including Discontinued Operation, Operating Expense	31,686,000	50,582,000
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	15,656,000	33,560,000
Disposal Group Including Discontinued Operation Interest And Other Income	52,000	28,000
Disposal Group Including Discontinued Operation Other Expenses	(1,000)	(111,000)
Interest (2)
Expense Incurred, Net	(34,000)	(699,000)
Disposal Group Including Discontinued Operation Amortization Of Deferred Financing Costs	(153,000)	(40,000)
Discontinued Operation, Tax Effect of Discontinued Operation	(56,000)	(101,000)
Income Loss From Discontinued Operations	15,464,000	32,637,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	1,198,922,000	132,956,000
Discontinued operations, net	1,214,386,000	165,593,000
Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net			1,446,500,000
Disposal Group Including Discontinued Operation Mortgage Notes Payable			$ 8,400,000