Investments In Unconsolidated Joint Ventures (Statements Of Operations Of The Joint Ventures) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Schedule of Equity Method Investments [Line Items]
Total revenue	$ 447,662,000		$ 417,214,000
Depreciation and amortization	109,673,000		109,237,000
Total expenses	303,001,000		279,321,000
Operating income	144,661,000		137,893,000
Interest expense	103,237,000		98,525,000
Net income (loss)	74,010,000		48,194,000
Income from unconsolidated joint ventures	11,721,000		7,976,000
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Total revenue	139,100,000	[1]	145,645,000	[1]
Operating	38,892,000		42,842,000
Depreciation and amortization	41,899,000		50,637,000
Total expenses	80,791,000		93,479,000
Operating income	58,309,000		52,166,000
Interest expense	55,362,000		57,761,000
Net income (loss)	2,947,000		(5,595,000)
Company's share of net income (loss)	1,371,000		(3,055,000)
Basis differential	466,000		1,756,000
Elimination of inter-entity interest on partner loan	9,884,000		9,275,000
Income from unconsolidated joint ventures	11,721,000		7,976,000
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Straight-line rent adjustments	4,300,000		4,100,000
"Above" and "below" market rent adjustments, net	$ 25,300,000		$ 29,500,000

[1] Includes straight-line rent adjustments of $4.3 million and $4.1 million for the three months ended March 31, 2012 and 2011, respectively. Includes net "below-" market rent adjustments of $25.3 million and $29.5 million for the three months ended March 31, 2012 and 2011, respectively.