Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
REVENUES    
Base rents $ 148,667 $ 147,711
Escalations and recoveries from tenants 20,150 27,180
Construction services 3,463 3,799
Real estate services 1,208 1,232
Other income 9,492 4,291
Total revenues 182,980 184,213
EXPENSES    
Real estate taxes 22,903 24,795
Utilities 16,102 19,742
Operating services 26,604 30,346
Direct construction costs 3,278 3,582
General and administrative 10,807 8,623
Depreciation and amortization 47,822 47,707
Total expenses 127,516 134,795
Operating income 55,464 49,418
OTHER (EXPENSE) INCOME    
Interest expense (30,629) (30,892)
Interest and other investment income 13 10
Equity in earnings (loss) of unconsolidated joint ventures 600 (101)
Total other (expense) income (30,016) (30,983)
Income from continuing operations 25,448 18,435
Discontinued operations:    
Income (loss) from discontinued operations (193) 140
Realized gains (losses) and unrealized losses on disposition of rental property, net 4,012   
Total discontinued operations, net 3,819 140
Net income 29,267 18,575
Noncontrolling interest in consolidated joint ventures 79 110
Noncontrolling interest in Operating Partnership (3,113) (2,437)
Noncontrolling interest in discontinued operations (466) (19)
Preferred stock dividends   (500)
Net income available to common shareholders $ 25,767 $ 15,729
Basic earnings per common share:    
Income from continuing operations $ 0.25 $ 0.19
Discontinued operations $ 0.04   
Net income available to common shareholders $ 0.29 $ 0.19
Diluted earnings per common share:    
Income from continuing operations $ 0.25 $ 0.19
Discontinued operations $ 0.04   
Net income available to common shareholders $ 0.29 $ 0.19
Basic weighted average shares outstanding 87,799 82,948
Diluted weighted average shares outstanding 100,062 96,015