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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.