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Consolidated Statement of Capital and Noncontrolling Interests Statement - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Common Stock, Shares, Outstanding 155,622,286   155,622,286     154,790,298    
Cumulative effect of a change in accounting principle     $ (1,679) $ (4,379)        
Effective portion of interest rate contracts $ (659) $ (4,426) (10,379) (7,054)        
Amortization of interest rate contracts 1,677 1,666 3,343 3,332        
Acquisition of noncontrolling interest in property partnership   (187,006)   (187,006)        
Contributions from noncontrolling interests in property partnerships 2,081 7,761 5,957 12,148        
Distributions to noncontrolling interests in property partnerships $ (13,315) $ (15,273) $ (29,065) $ (39,401)        
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 1,725,000 1,722,000
Contributions, units 0 1,000 1,000 3,000        
Conversion of redeemable partnership units 0   3,000 1,000        
Limited Partner [Member]                
Common Stock, Shares, Outstanding 153,891,000 152,837,000 153,891,000 152,837,000 153,584,000 153,063,000 152,790,000 152,736,000
Contributions, units 5,000 26,000 68,000 67,000        
Conversion of redeemable partnership units 302,000 21,000 760,000 34,000        
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 5,250 5,250        
Distributions (2,625) (2,625) (5,250) (5,250)        
Accumulated Other Comprehensive Loss [Member]                
Beginning Balance (54,921) (51,340) (54,921) (51,340) (55,700) (48,335) (48,734) (47,741)
Effective portion of interest rate contracts (601) (3,973) (9,333) (6,332)        
Amortization of interest rate contracts 1,380 1,367 2,747 2,733        
Noncontrolling interest - property partnerships [Member]                
Beginning Balance 1,724,588 1,696,221 1,724,588 1,696,221 1,736,445 1,728,689 1,710,608 1,711,445
Cumulative effect of a change in accounting principle     0 (70)        
Allocated net income for the period (767) 17,482 18,719 36,312        
Effective portion of interest rate contracts     0 0        
Amortization of interest rate contracts 144 144 288 288        
Acquisition of noncontrolling interest in property partnership   (24,501)   (24,501)        
Contributions from noncontrolling interests in property partnerships 2,081 7,761 5,957 12,148        
Distributions to noncontrolling interests in property partnerships (13,315) (15,273) (29,065) (39,401)        
Total Capital [Member]                
Beginning Balance 6,691,356 5,401,414 6,691,356 5,401,414 6,500,995 5,254,152 5,458,671 5,912,323
Cumulative effect of a change in accounting principle     (1,505) (3,934)        
Contributions, value 450 882 7,162 5,702        
Allocated net income for the period 273,847 186,794 804,752 310,032        
Distributions (155,132) (149,460) (309,965) (298,875)        
Unearned compensation 423 613 1,419 (775)        
Conversion of redeemable partnership units, value 10,849 720 26,344 1,212        
Adjustment to reflect redeemable partnership units at redemption value 70,235 100,174 938,403 (306,701)        
Effective portion of interest rate contracts (601) (3,973) (9,333) (6,332)        
Amortization of interest rate contracts 1,524 1,511 3,035 3,021        
Acquisition of noncontrolling interest in property partnership   (187,006)   (187,006)        
Contributions from noncontrolling interests in property partnerships 2,081 7,761 5,957 12,148        
Distributions to noncontrolling interests in property partnerships (13,315) (15,273) (29,065) (39,401)        
Noncontrolling interest - Redeemable partnership units [Member]                
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount 1,581,010 2,324,238 1,581,010 2,324,238 1,639,855 2,468,753 2,414,240 2,000,591
Cumulative effect of a change in accounting principle     (174) (445)        
Contributions, value (98) 1,082 39,643 35,482        
Allocated net income for the period 29,986 19,028 87,525 30,627        
Distributions (17,194) (17,206) (34,638) (34,391)        
Unearned compensation 9,450 8,286 (14,614) (12,704)        
Conversion of redeemable partnership units, value (10,849) (720) (26,344) (1,212)        
Adjustment to reflect redeemable partnership units at redemption value (70,235) (100,174) (938,403) 306,701        
Effective portion of interest rate contracts (58) (453) (1,046) (722)        
Amortization of interest rate contracts 153 155 308 311        
Partners' Capital (General and Limited Partners)[Member]                
Beginning Balance 4,828,066 3,562,910 4,828,066 3,562,910 $ 4,626,627 $ 3,380,175 $ 3,603,174 $ 4,054,996
Cumulative effect of a change in accounting principle     (1,505) (3,864)        
Contributions, value 450 882 7,162 5,702        
Allocated net income for the period 271,989 166,687 780,783 268,470        
Distributions (152,507) (146,835) (304,715) (293,625)        
Unearned compensation 423 613 1,419 (775)        
Conversion of redeemable partnership units, value 10,849 720 26,344 1,212        
Adjustment to reflect redeemable partnership units at redemption value $ 70,235 100,174 $ 938,403 (306,701)        
Acquisition of noncontrolling interest in property partnership   $ (162,505)   $ (162,505)