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Consolidated Statements Of Equity - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock [Member]
Preferred Stock [Member]
Additional Paid-In Capital [Member]
Dividends In Excess Of Earnings [Member]
Dividends In Excess Of Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment
Treasury Stock, at cost [Member]
Accumulated Other Comprehensive Loss [Member]
Noncontrolling Interests [Member]
Noncontrolling Interests [Member]
Cumulative Effect, Period of Adoption, Adjustment
Noncontrolling interest - property partnerships [Member]
Noncontrolling interest - property partnerships [Member]
Cumulative Effect, Period of Adoption, Adjustment
Equity, shares at Dec. 31, 2017     154,325,000                    
Equity, value at Dec. 31, 2017 $ 8,102,456 $ 5,496 $ 1,543 $ 200,000 $ 6,377,908 $ (712,343) $ 4,933 $ (2,722) $ (50,429) $ 604,739 $ 563 $ 1,683,760  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Redemption of operating partnership units to common stock, shares     83,000                    
Redemption of operating partnership units to common stock, value 0   $ 2   2,878         (2,880)      
Allocated net income for the year 712,563         582,847       66,807   62,909  
Dividends/distributions declared (613,702)         (550,971)       (62,731)      
Shares issued pursuant to stock purchase plan, shares     6,000                    
Shares issued pursuant to stock purchase plan, value 797       797                
Net activity from stock option and incentive plan, shares     44,000                    
Net activity from stock option and incentive plan, value 38,590   $ 0   1,729         36,861      
Contributions from noncontrolling interests in property partnerships 46,701                     46,701  
Distributions to noncontrolling interests in property partnerships (82,501)                     (82,501)  
Effective portion of interest rate contracts (3,096)               (2,781) (315)   0  
Amortization of interest rate contracts 6,664               5,469 619   576  
Reallocation of noncontrolling interest 0       24,311         (24,311)      
Equity, shares at Dec. 31, 2018     154,458,000                    
Equity, value at Dec. 31, 2018 $ 8,213,968 (4,379) $ 1,545 200,000 6,407,623 (675,534) (3,864) (2,722) (47,741) 619,352 (445) 1,711,445 $ (70)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Accounting Standards Update [Extensible List] | Accounting Standards Update 2014-09 us-gaap:AccountingStandardsUpdate201409Member                        
Redemption of operating partnership units to common stock, shares     145,000                    
Redemption of operating partnership units to common stock, value $ 0   $ 2   4,883         (4,885)      
Allocated net income for the year 651,999         521,534       59,345   71,120  
Dividends/distributions declared (671,893)         (602,659)       (69,234)      
Shares issued pursuant to stock purchase plan, shares     6,000                    
Shares issued pursuant to stock purchase plan, value 688       688                
Net activity from stock option and incentive plan, shares     181,000                    
Net activity from stock option and incentive plan, value 45,000   $ 1   8,771         36,228      
Sale of an interest in property partnerships 0       (4,216)             4,216  
Acquisition of noncontrolling interest in property partnership (186,963)       (162,462)             (24,501)  
Contributions from noncontrolling interests in property partnerships 35,816                     35,816  
Distributions to noncontrolling interests in property partnerships (69,913)                     (69,913)  
Effective portion of interest rate contracts (6,751)               (6,060) (691)   0  
Amortization of interest rate contracts 6,664               5,466 622   576  
Reallocation of noncontrolling interest $ 0       39,432         (39,432)      
Equity, shares at Dec. 31, 2019 154,790,298   154,790,000                    
Equity, value at Dec. 31, 2019 $ 8,014,236 $ (1,679) $ 1,548 200,000 6,294,719 (760,523) $ (1,505) (2,722) (48,335) 600,860 $ (174) 1,728,689  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Accounting Standards Update [Extensible List] | Accounting Standards Update 2016-02 us-gaap:AccountingStandardsUpdate201602Member                        
Redemption of operating partnership units to common stock, shares     857,000                    
Redemption of operating partnership units to common stock, value $ 0   $ 9   29,689         (29,698)      
Allocated net income for the year 1,018,691         872,727       97,704   48,260  
Dividends/distributions declared (689,273)         (620,352)       (68,921)      
Shares issued pursuant to stock purchase plan, shares     7,000                    
Shares issued pursuant to stock purchase plan, value 759       759                
Net activity from stock option and incentive plan, shares     65,000                    
Net activity from stock option and incentive plan, value 48,621   $ 0   9,303         39,318      
Contributions from noncontrolling interests in property partnerships 8,219                     8,219  
Distributions to noncontrolling interests in property partnerships (58,811)                     (58,811)  
Effective portion of interest rate contracts (7,848)               (7,066) (782)   0  
Amortization of interest rate contracts 6,697               5,511 610   576  
Reallocation of noncontrolling interest $ 0       22,321         (22,321)      
Equity, shares at Dec. 31, 2020 155,718,825   155,719,000                    
Equity, value at Dec. 31, 2020 $ 8,339,612   $ 1,557 $ 200,000 $ 6,356,791 $ (509,653)   $ (2,722) $ (49,890) $ 616,596   $ 1,726,933  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Accounting Standards Update [Extensible List] | Accounting Standards Update 2018-09 us-gaap:AccountingStandardsUpdate201809Member