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Consolidated Statement of Capital and Noncontrolling Interests - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Common Stock, Shares, Outstanding 155,718,825 154,790,298    
Beginning Balance      
Effective portion of interest rate contracts $ (7,848) $ (6,751) $ (3,096)  
Amortization of interest rate contracts 6,697 6,664 6,664  
Acquisition of noncontrolling interest in property partnership   (186,963)    
Sale of an interest in property partnerships   0    
Contributions from noncontrolling interests in property partnerships 8,219 35,816 46,701  
Distributions to noncontrolling interests in property partnerships $ (58,811) $ (69,913) $ (82,501)  
Accounting Standards Update 2014-09        
Accounting Standards Update [Extensible List]     us-gaap:AccountingStandardsUpdate201409Member  
Accounting Standards Update 2016-02        
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201602Member    
Accounting Standards Update 2018-09        
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201809Member      
General Partner [Member]        
Common Stock, Shares, Outstanding 1,731,000 1,727,000 1,722,000 1,720,000
Contributions, units 1,000 3,000 1,000  
Conversion of redeemable partnership units 3,000 2,000 1,000  
Limited Partner [Member]        
Common Stock, Shares, Outstanding 153,988,000 153,063,000 152,736,000 152,606,000
Contributions, units 72,000 185,000 49,000  
Conversion of redeemable partnership units 853,000 142,000 81,000  
Partners' Capital (General and Limited Partners)[Member]        
Beginning Balance $ 4,554,639 $ 3,380,175 $ 4,054,996 $ 3,664,436
Contributions, value 7,529 17,115 1,642  
Allocated net income for the period 882,275 520,757 590,096  
Distributions (609,852) (592,159) (540,471)  
Unearned compensation 2,533 (7,655) 884  
Conversion of redeemable partnership units, value 29,689 4,885 2,880  
Adjustment to reflect redeemable partnership units at redemption value 863,795 (447,222) 330,596  
Acquisition of noncontrolling interest in property partnership   (162,462)    
Sale of an interest in property partnerships   (4,216)    
Partners' Capital (General and Limited Partners)[Member] | Cumulative Effect, Period of Adoption, Adjustment        
Beginning Balance   (1,505) (3,864) 4,933
Preferred Units [Member]        
Beginning Balance 193,623 193,623 193,623 193,623
Allocated net income for the period 10,500 10,500 10,500  
Distributions (10,500) (10,500) (10,500)  
Accumulated Other Comprehensive Loss [Member]        
Beginning Balance (49,890) (48,335) (47,741) (50,429)
Effective portion of interest rate contracts (7,066) (6,060) (2,781)  
Amortization of interest rate contracts 5,511 5,466 5,469  
Noncontrolling interest - property partnerships [Member]        
Beginning Balance 1,726,933 1,728,689 1,711,445 1,683,760
Allocated net income for the period 48,260 71,120 62,909  
Effective portion of interest rate contracts 0 0 0  
Amortization of interest rate contracts 576 576 576  
Acquisition of noncontrolling interest in property partnership   (24,501)    
Sale of an interest in property partnerships   4,216    
Contributions from noncontrolling interests in property partnerships 8,219 35,816 46,701  
Distributions to noncontrolling interests in property partnerships (58,811) (69,913) (82,501)  
Noncontrolling interest - property partnerships [Member] | Cumulative Effect, Period of Adoption, Adjustment        
Beginning Balance     (70)  
Total Capital [Member]        
Beginning Balance 6,425,305 5,254,152 5,912,323 5,491,390
Contributions, value 7,529 17,115 1,642  
Allocated net income for the period 941,035 602,377 663,505  
Distributions (620,352) (602,659) (550,971)  
Unearned compensation 2,533 (7,655) 884  
Conversion of redeemable partnership units, value 29,689 4,885 2,880  
Adjustment to reflect redeemable partnership units at redemption value 863,795 (447,222) 330,596  
Effective portion of interest rate contracts (7,066) (6,060) (2,781)  
Amortization of interest rate contracts 6,087 6,042 6,045  
Acquisition of noncontrolling interest in property partnership   (186,963)    
Contributions from noncontrolling interests in property partnerships 8,219 35,816 46,701  
Distributions to noncontrolling interests in property partnerships (58,811) (69,913) (82,501)  
Total Capital [Member] | Cumulative Effect, Period of Adoption, Adjustment        
Beginning Balance   (1,505) (3,934) 4,933
Noncontrolling interest - Redeemable partnership units [Member]        
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount 1,643,024 2,468,753 2,000,591 2,292,263
Contributions, value 38,841 34,217 34,680  
Allocated net income for the period 97,704 59,345 66,807  
Distributions (68,921) (69,234) (62,731)  
Unearned compensation 477 2,011 2,181  
Conversion of redeemable partnership units, value (29,689) (4,885) (2,880)  
Adjustment to reflect redeemable partnership units at redemption value (863,795) 447,222 (330,596)  
Effective portion of interest rate contracts (782) (691) (315)  
Amortization of interest rate contracts $ 610 622 619  
Noncontrolling interest - Redeemable partnership units [Member] | Cumulative Effect, Period of Adoption, Adjustment        
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount   $ (174) $ (445) $ 563