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Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands, except Share data
Common Stock [Member]
Additional Paid-In Capital [Member]
Earnings (Dividends) In Excess Of Dividends (Earnings) [Member]
Treasury Stock, At cost [Member]
Accumulated Other Comprehensive Loss [Member]
Noncontrolling Interests [Member]
Total
Equity, value at Dec. 31, 2009$ 1,389$ 4,373,679$ 95,433$ (2,722)$ (21,777)$ 623,057$ 5,069,059
Equity, shares at Dec. 31, 2009138,880,000      
Statement of Stockholders' Equity [Line Items]       
Conversion of operating partnership units to Common Stock, shares473,000      
Conversion of operating partnership units to Common Stock, value513,743   (13,748) 
Reallocation of noncontrolling interest 12,944   (12,944) 
Allocated net income for the year  171,786  28,749200,535
Dividends/distributions declared  (209,168)  (32,069)(241,237)
Shares issued pursuant to stock purchase plan, shares9,000      
Shares issued pursuant to stock purchase plan, value 630    630
Net activity from stock option and incentive plan, shares696,000      
Net activity from stock option and incentive plan, value723,715   24,30648,028
Distributions to noncontrolling interests in property partnerships     (1,500)(1,500)
Amortization of interest rate contracts    2,2473312,578
Equity, value at Sep. 30, 20101,4014,424,71158,051(2,722)(19,530)616,1825,078,093
Equity, shares at Sep. 30, 2010140,058,000      
Equity, value at Dec. 31, 20101,4024,417,162(24,763)(2,722)(18,436)591,5504,964,193
Equity, shares at Dec. 31, 2010140,199,000     140,199,105
Statement of Stockholders' Equity [Line Items]       
Conversion of operating partnership units to Common Stock, shares2,443,000      
Conversion of operating partnership units to Common Stock, value2471,157   (71,181) 
Reallocation of noncontrolling interest (26,755)   26,755 
Allocated net income for the year  171,359  24,527195,886
Dividends/distributions declared  (219,537)  (29,120)(248,657)
Sale of common stock, net of offering costs, shares4,660,000      
Sale of common stock, net of offering costs, value47438,990    439,037
Shares issued pursuant to stock purchase plan, shares7,000      
Shares issued pursuant to stock purchase plan, value 620    620
Net activity from stock option and incentive plan, shares318,000      
Net activity from stock option and incentive plan, value315,266   17,36732,636
Distributions to noncontrolling interests in property partnerships     (1,500)(1,500)
Amortization of interest rate contracts    1,7192271,946
Equity, value at Sep. 30, 2011$ 1,476$ 4,916,440$ (72,941)$ (2,722)$ (16,717)$ 558,625$ 5,384,161
Equity, shares at Sep. 30, 2011147,627,000     147,627,247