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Consolidated Statement of Capital and Noncontrolling Interests Statement - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Common Stock, Shares, Outstanding 155,636,300   155,636,300     154,790,298    
Cumulative effect of a change in accounting principle     $ (1,679) $ (4,379)        
Effective portion of interest rate contracts $ 1,027 $ (2,253) (9,352) (9,307)        
Amortization of interest rate contracts 1,677 1,666 5,020 4,998        
Acquisition of noncontrolling interest in property partnership   43   (186,963)        
Sale of an interest in property partnerships   0   0        
Contributions from noncontrolling interests in property partnerships 1,407 14,820 7,364 26,968        
Distributions to noncontrolling interests in property partnerships $ (11,026) $ (13,748) $ (40,091) $ (53,149)        
General Partner [Member]                
Common Stock, Shares, Outstanding 1,731,000 1,726,000 1,731,000 1,726,000 1,731,000 1,727,000 1,726,000 1,722,000
Contributions, units 0 0 1,000 3,000        
Conversion of redeemable partnership units 0   3,000 1,000        
Limited Partner [Member]                
Common Stock, Shares, Outstanding 153,905,000 152,846,000 153,905,000 152,846,000 153,891,000 153,063,000 152,837,000 152,736,000
Contributions, units 5,000 2,000 73,000 69,000        
Conversion of redeemable partnership units 9,000 7,000 769,000 41,000        
Partners' Capital (General and Limited Partners)[Member]                
Beginning Balance $ 4,943,849 $ 3,505,572 $ 4,943,849 $ 3,505,572 $ 4,828,066 $ 3,380,175 $ 3,562,910 $ 4,054,996
Cumulative effect of a change in accounting principle     (1,505) (3,864)        
Contributions, value 421 (3,915) 7,583 1,787        
Allocated net income for the period 92,059 109,611 872,842 378,081        
Distributions (152,518) (146,843) (457,233) (440,468)        
Unearned compensation 1,403 (7,205) 2,822 (7,980)        
Conversion of redeemable partnership units, value 338 223 26,682 1,435        
Adjustment to reflect redeemable partnership units at redemption value 174,080 (9,252) 1,112,483 (315,953)        
Acquisition of noncontrolling interest in property partnership   43   (162,462)        
Preferred Units [Member]                
Beginning Balance 193,623 193,623 193,623 193,623 193,623 193,623 193,623 193,623
Allocated net income for the period 2,625 2,625 7,875 7,875        
Distributions (2,625) (2,625) (7,875) (7,875)        
Accumulated Other Comprehensive Loss [Member]                
Beginning Balance (52,622) (51,996) (52,622) (51,996) (54,921) (48,335) (51,340) (47,741)
Effective portion of interest rate contracts 917 (2,022) (8,416) (8,354)        
Amortization of interest rate contracts 1,382 1,366 4,129 4,099        
Noncontrolling interest - property partnerships [Member]                
Beginning Balance 1,730,674 1,720,123 1,730,674 1,720,123 1,724,588 1,728,689 1,696,221 1,711,445
Cumulative effect of a change in accounting principle     0 (70)        
Allocated net income for the period 15,561 18,470 34,280 54,782        
Effective portion of interest rate contracts     0 0        
Amortization of interest rate contracts 144 144 432 432        
Acquisition of noncontrolling interest in property partnership   0   (24,501)        
Sale of an interest in property partnerships   4,216   4,216        
Contributions from noncontrolling interests in property partnerships 1,407 14,820 7,364 26,968        
Distributions to noncontrolling interests in property partnerships (11,026) (13,748) (40,091) (53,149)        
Total Capital [Member]                
Beginning Balance 6,815,524 5,367,322 6,815,524 5,367,322 6,691,356 5,254,152 5,401,414 5,912,323
Cumulative effect of a change in accounting principle     (1,505) (3,934)        
Contributions, value 421 (3,915) 7,583 1,787        
Allocated net income for the period 110,245 130,706 914,997 440,738        
Distributions (155,143) (149,468) (465,108) (448,343)        
Unearned compensation 1,403 (7,205) 2,822 (7,980)        
Conversion of redeemable partnership units, value 338 223 26,682 1,435        
Adjustment to reflect redeemable partnership units at redemption value 174,080 (9,252) 1,112,483 (315,953)        
Effective portion of interest rate contracts 917 (2,022) (8,416) (8,354)        
Amortization of interest rate contracts 1,526 1,510 4,561 4,531        
Acquisition of noncontrolling interest in property partnership   43   (186,963)        
Sale of an interest in property partnerships   4,216   4,216        
Contributions from noncontrolling interests in property partnerships 1,407 14,820 7,364 26,968        
Distributions to noncontrolling interests in property partnerships (11,026) (13,748) (40,091) (53,149)        
Noncontrolling interest - Redeemable partnership units [Member]                
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount 1,406,484 2,335,272 1,406,484 2,335,272 $ 1,581,010 $ 2,468,753 $ 2,324,238 $ 2,000,591
Cumulative effect of a change in accounting principle     (174) (445)        
Contributions, value (219)   39,424 35,482        
Allocated net income for the period 9,565 12,506 97,090 43,133        
Distributions (17,183) (17,200) (51,821) (51,591)        
Unearned compensation 7,468 6,774 (7,146) (5,930)        
Conversion of redeemable partnership units, value (338) (223) (26,682) (1,435)        
Adjustment to reflect redeemable partnership units at redemption value (174,080) 9,252 (1,112,483) 315,953        
Effective portion of interest rate contracts 110 (231) (936) (953)        
Amortization of interest rate contracts $ 151 156 $ 459 $ 467        
Sale of an interest in property partnerships   $ 0