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Investments in Unconsolidated Joint Ventures (Statements of Operations of the Joint Ventures) (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Unconsolidated Joint Ventures [Member]
Mar. 31, 2012
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]        
Total revenue $ 483,014,000 $ 443,693,000 $ 135,650,000 [1] $ 139,100,000 [1]
Expenses        
Operating     42,366,000 38,892,000
Depreciation and amortization 120,595,000 108,462,000 39,277,000 41,899,000
Total expenses 352,579,000 300,126,000 81,643,000 80,791,000
Operating income 130,435,000 143,567,000 54,007,000 58,309,000
Other expense        
Interest expense 100,433,000 103,237,000 56,234,000 55,362,000
Net income 57,931,000 55,835,000 (2,227,000) 2,947,000
Company's share of net income (loss)     (1,858,000) 1,371,000
Basis differential     444,000 466,000
Elimination of inter-entity interest on partner loan     10,135,000 9,884,000
Income from unconsolidated joint ventures 8,721,000 11,721,000 8,721,000 11,721,000
Straight-line rent adjustments     4,000,000 4,300,000
"Above" and "below" market rent adjustments, net     $ 20,400,000 $ 25,300,000
[1] Includes straight-line rent adjustments of $4.0 million and $4.3 million for the three months ended March 31, 2013 and 2012, respectively. Includes net below-market rent adjustments of $20.4 million and $25.3 million for the three months ended March 31, 2013 and 2012, respectively.