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Consolidated Statements Of Stockholders' Equity - USD ($)
Total
Common Stock [Member]
Preferred Stock [Member]
Additional Paid-In Capital [Member]
Dividends In Excess Of Earnings [Member]
Treasury Stock, At Cost [Member]
Accumulated Other Comprehensive (Income) Loss [Member]
Noncontrolling Interests - Common units [Member]
Noncontrolling interest - property partnerships [Member]
Equity, value at Dec. 31, 2017 $ 8,102,456,000 $ 1,543,000 $ 200,000,000 $ 6,377,908,000 $ (712,343,000) $ (2,722,000) $ (50,429,000) $ 604,739,000 $ 1,683,760,000
Equity, shares at Dec. 31, 2017   154,325,000              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cumulative effect of a change in accounting principle 5,496,000       4,933,000     563,000  
Redemption of operating partnership units to Common Stock, shares   35,000              
Redemption of operating partnership units to Common Stock, value 0 $ 1,000   1,195,000       (1,196,000)  
Allocated net income for the year 376,877,000       309,932,000     35,311,000 31,634,000
Dividends/distributions declared (280,977,000)       (252,269,000)     (28,708,000)  
Shares issued pursuant to stock purchase plan, shares   3,000              
Shares issued pursuant to stock purchase plan, value 429,000     429,000          
Net activity from stock option and incentive plan, shares   49,000              
Net activity from stock option and incentive plan, value 22,130,000     600,000       21,530,000  
Contributions from noncontrolling interests in property partnerships (27,532,000)               (27,532,000)
Distributions to noncontrolling interests in property partnerships (44,033,000)               (44,033,000)
Amortization of interest rate contracts 3,332,000           2,734,000 310,000 288,000
Reallocation of noncontrolling interest 0     11,328,000       (11,328,000)  
Equity, value at Jun. 30, 2018 8,213,242,000 $ 1,544,000 200,000,000 6,391,460,000 (649,747,000) (2,722,000) (47,695,000) 621,221,000 1,699,181,000
Equity, shares at Jun. 30, 2018   154,412,000              
Equity, value at Mar. 31, 2018 8,184,090,000 $ 1,544,000 200,000,000 6,384,147,000 (654,879,000) (2,722,000) (49,062,000) 619,347,000 1,685,715,000
Equity, shares at Mar. 31, 2018   154,362,000              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Redemption of operating partnership units to Common Stock, shares   11,000              
Redemption of operating partnership units to Common Stock, value 0 $ 0   364,000       (364,000)  
Allocated net income for the year 160,565,000       131,286,000     14,879,000 14,400,000
Dividends/distributions declared (140,511,000)       (126,154,000)     (14,357,000)  
Shares issued pursuant to stock purchase plan, shares   0              
Shares issued pursuant to stock purchase plan, value 0     0          
Net activity from stock option and incentive plan, shares   39,000              
Net activity from stock option and incentive plan, value 8,510,000     785,000       7,725,000  
Contributions from noncontrolling interests in property partnerships 12,265,000               12,265,000
Distributions to noncontrolling interests in property partnerships (13,343,000)               (13,343,000)
Amortization of interest rate contracts 1,666,000           1,367,000 155,000 144,000
Reallocation of noncontrolling interest 0     6,164,000       (6,164,000)  
Equity, value at Jun. 30, 2018 8,213,242,000 $ 1,544,000 200,000,000 6,391,460,000 (649,747,000) (2,722,000) (47,695,000) 621,221,000 1,699,181,000
Equity, shares at Jun. 30, 2018   154,412,000              
Equity, value at Dec. 31, 2018 $ 8,213,968,000 $ 1,545,000 200,000,000 6,407,623,000 (675,534,000) (2,722,000) (47,741,000) 619,352,000 1,711,445,000
Equity, shares at Dec. 31, 2018 154,458,478 154,458,000              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cumulative effect of a change in accounting principle $ (4,379,000)       (3,864,000)     (445,000) (70,000)
Redemption of operating partnership units to Common Stock, shares   35,000              
Redemption of operating partnership units to Common Stock, value 0 $ 1,000   1,211,000       (1,212,000)  
Allocated net income for the year 334,620,000       267,681,000     30,627,000 36,312,000
Dividends/distributions declared (333,266,000)       (298,875,000)     (34,391,000)  
Shares issued pursuant to stock purchase plan, shares   4,000              
Shares issued pursuant to stock purchase plan, value 373,000     373,000          
Net activity from stock option and incentive plan, shares   66,000              
Net activity from stock option and incentive plan, value 27,332,000     4,554,000       22,778,000  
Acquisition of noncontrolling interest in property partnerships (187,006,000)     (162,505,000)         (24,501,000)
Contributions from noncontrolling interests in property partnerships (12,148,000)               (12,148,000)
Distributions to noncontrolling interests in property partnerships (39,401,000)               39,401,000
Effective portion of interest rate contracts (7,054,000)           (6,332,000) (722,000)  
Amortization of interest rate contracts 3,332,000           2,733,000 311,000 288,000
Reallocation of noncontrolling interest 0     27,705,000       (27,705,000)  
Equity, value at Jun. 30, 2019 $ 8,020,667,000 $ 1,546,000 200,000,000 6,278,961,000 (710,592,000) (2,722,000) (51,340,000) 608,593,000 1,696,221,000
Equity, shares at Jun. 30, 2019 154,563,130 154,563,000              
Equity, value at Mar. 31, 2019 $ 8,170,287,000 $ 1,545,000 200,000,000 6,414,612,000 (728,083,000) (2,722,000) (48,734,000) 623,061,000 1,710,608,000
Equity, shares at Mar. 31, 2019   154,515,000              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cumulative effect of a change in accounting principle                 0
Redemption of operating partnership units to Common Stock, shares   21,000              
Redemption of operating partnership units to Common Stock, value 0 $ 1,000   719,000       (720,000)  
Allocated net income for the year 203,461,000       166,951,000     19,028,000 17,482,000
Dividends/distributions declared (166,666,000)       (149,460,000)     (17,206,000)  
Shares issued pursuant to stock purchase plan, shares   0              
Shares issued pursuant to stock purchase plan, value       0          
Net activity from stock option and incentive plan, shares   27,000              
Net activity from stock option and incentive plan, value 10,863,000     1,495,000       9,368,000  
Acquisition of noncontrolling interest in property partnerships (187,006,000)     (162,505,000)         (24,501,000)
Contributions from noncontrolling interests in property partnerships 7,761,000               7,761,000
Distributions to noncontrolling interests in property partnerships (15,273,000)               (15,273,000)
Effective portion of interest rate contracts (4,426,000)           (3,973,000) (453,000)  
Amortization of interest rate contracts 1,666,000           1,367,000 155,000 144,000
Reallocation of noncontrolling interest 0     24,640,000       (24,640,000)  
Equity, value at Jun. 30, 2019 $ 8,020,667,000 $ 1,546,000 $ 200,000,000 $ 6,278,961,000 $ (710,592,000) $ (2,722,000) $ (51,340,000) $ 608,593,000 $ 1,696,221,000
Equity, shares at Jun. 30, 2019 154,563,130 154,563,000