Quarterly report pursuant to Section 13 or 15(d)

Segment Reporting (Schedule Of Reconciliation Of Net Operating Income To Income From Continuing Operations) (Details)

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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Segment Reporting Information [Line Items]        
Net operating income $ 60,187 [1] $ 60,955 [1] $ 117,414 [1] $ 130,321 [1]
Depreciation and amortization (48,422) (46,326) (94,482) (92,526)
Impairments (23,851)   (23,851)  
Loss from early extinguishment of debt   (4,415)   (4,415)
Income from continuing operations (12,086) 10,214 (919) 33,380
Income from discontinued operations 1,364 2,831 3,286 4,920
Loss from early extinguishment of debt (703)   (703)  
Realized gains (losses) and unrealized losses on disposition of rental property, net 37,609 (1,634) 37,609 2,378
Total discontinued operations, net 38,270 1,197 40,192 7,298
Net income 26,184 11,411 39,273 40,678
Noncontrolling interest in consolidated joint ventures 62 92 124 171
Noncontrolling interest in Operating Partnership 1,455 (1,256) 93 (4,090)
Noncontrolling interest in discontinued operations (4,630) (146) (4,863) (891)
Net income available to common shareholders 23,071 10,101 34,627 35,868
Operating Segments [Member]
        
Segment Reporting Information [Line Items]        
Net operating income 60,187 60,955 117,414 130,321
Net income available to common shareholders 23,071 10,101 34,627 35,868
Segment Reconciling Items [Member]
        
Segment Reporting Information [Line Items]        
Depreciation and amortization (48,422) (46,326) (94,482) (92,526)
Impairments (23,851)   (23,851)  
Loss from early extinguishment of debt   (4,415)   (4,415)
Noncontrolling interest in consolidated joint ventures 62 92 124 171
Noncontrolling interest in Operating Partnership 1,455 (1,256) 93 (4,090)
Noncontrolling interest in discontinued operations $ (4,630) $ (146) $ (4,863) $ (891)
[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.