Segment Reporting (Schedule Of Reconciliation Of Net Operating Income To Income From Continuing Operations) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting [Abstract]        
Net operating income $ 47,474 [1] $ 54,264 [1] $ 74,831 [1] $ 105,568 [1]
Depreciation and amortization (44,711) (45,665) (89,696) (89,013)
Realized gains and unrealized losses on disposition of rental property, net 54,584   54,584  
Income from continuing operations 57,347 8,599 39,719 16,555
Income from discontinued operations   4,530   9,663
Loss from early extinguishment of debt   (703)   (703)
Realized gains and unrealized losses on disposition of rental property, net   13,758   13,758
Total discontinued operations   17,585   22,718
Net income 57,347 26,184 39,719 39,273
Noncontrolling interest in consolidated joint ventures 290 62 612 124
Noncontrolling interest in Operating Partnership (6,514) (1,048) (4,506) (2,021)
Noncontrolling interest in discontinued operations   (2,127)   (2,749)
Net income available to common shareholders $ 51,123 $ 23,071 $ 35,825 $ 34,627
[1] Net operating income represents total revenues less total operating and interest expenses (as defined in Note “a”), plus equity in earnings (loss) of unconsolidated joint ventures, for the period.