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Consolidated Statements Of Stockholders' Equity - USD ($)
$ in Thousands
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 [Member]
Equity, value at Dec. 31, 2016 $ 7,931,924 $ 1,538 $ 200,000 $ 6,333,424 $ (693,694) $ (2,722) $ (52,251) $ 2,145,629
Equity, shares at Dec. 31, 2016   153,790,000            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Conversion of operating partnership units to Common Stock, shares   481,000            
Conversion of operating partnership units to Common Stock, value 0 $ 5   16,417       (16,422)
Allocated net income for the year 282,574       236,014     46,560
Dividends/distributions declared (263,345)       (236,368)     (26,977)
Shares issued pursuant to stock purchase plan, shares   3,000            
Shares issued pursuant to stock purchase plan, value 373     373        
Net activity from stock option and incentive plan, shares   34,000            
Net activity from stock option and incentive plan, value 21,168 $ 0   1,980       19,188
Cumulative effect of a change in accounting principle (2,035)       (272)     (1,763)
Contributions from noncontrolling interests in property partnerships 133,072             133,072
Distributions to noncontrolling interests in property partnerships (26,949)             (26,949)
Effective portion of interest rate contracts (6,133)           (3,301) (2,832)
Amortization of interest rate contracts 2,703           2,391 312
Reallocation of noncontrolling interest 0     10,840       (10,840)
Equity, value at Jun. 30, 2017 8,073,352 $ 1,543 200,000 6,363,034 (694,320) (2,722) (53,161) 2,258,978
Equity, shares at Jun. 30, 2017   154,308,000            
Equity, value at Dec. 31, 2017 $ 8,102,456 $ 1,543 200,000 6,377,908 (712,343) (2,722) (50,429) 2,288,499
Equity, shares at Dec. 31, 2017 154,325,286 154,325,000            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Conversion of operating partnership units to Common Stock, shares   35,000            
Conversion of operating partnership units to Common Stock, value   $ 1   1,195       (1,196)
Allocated net income for the year $ 376,877       309,932     66,945
Dividends/distributions declared (280,977)       (252,269)     (28,708)
Shares issued pursuant to stock purchase plan, shares   3,000            
Shares issued pursuant to stock purchase plan, value 429     429        
Net activity from stock option and incentive plan, shares   49,000            
Net activity from stock option and incentive plan, value 22,130     600       21,530
Cumulative effect of a change in accounting principle 5,496       4,933     563
Contributions from noncontrolling interests in property partnerships 27,532             27,532
Distributions to noncontrolling interests in property partnerships (44,033)             (44,033)
Amortization of interest rate contracts 3,332           2,734 598
Reallocation of noncontrolling interest       11,328       (11,328)
Equity, value at Jun. 30, 2018 $ 8,213,242 $ 1,544 $ 200,000 $ 6,391,460 $ (649,747) $ (2,722) $ (47,695) $ 2,320,402
Equity, shares at Jun. 30, 2018 154,411,529 154,412,000