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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 Loss [Member]
Noncontrolling Interests [Member]
Equity, value at Dec. 31, 2015 $ 7,886,927 $ 1,536 $ 200,000 $ 6,305,687 $ (780,952) $ (2,722) $ (14,114) $ 2,177,492
Equity, shares at Dec. 31, 2015   153,580,000            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Redemption of operating partnership units to common stock   191,000            
Redemption of operating partnership units to common stock 0 $ 2   6,459       (6,461)
Allocated net income for the year 569,977       512,785     57,192
Dividends/distributions declared (474,614)       (425,527)     (49,087)
Shares issued pursuant to stock purchase plan, shares   6,000            
Shares issued pursuant to stock purchase plan, value 730     730        
Net activity from stock option and incentive plan, shares   13,000            
Net activity from stock option and incentive plan, value 31,910     3,979       27,931
Sale of interests in property partnerships 0     1,195       (1,195)
Contributions from noncontrolling interests in property partnerships 11,951             11,951
Distributions to noncontrolling interests in property partnerships (51,564)             (51,564)
Effective portion of interest rate contracts (47,144)           (41,502) (5,642)
Amortization of interest rate contracts 3,751           3,365 386
Reallocation of noncontrolling interest 0     15,374       (15,374)
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]                
Cumulative effect of a change in accounting principle (2,035)       (272)     (1,763)
Redemption of operating partnership units to common stock   495,000            
Redemption of operating partnership units to common stock 0 $ 5   16,911       (16,916)
Allocated net income for the year 562,481       462,439     100,042
Dividends/distributions declared (535,310)       (480,816)     (54,494)
Shares issued pursuant to stock purchase plan, shares   6,000            
Shares issued pursuant to stock purchase plan, value 795     795        
Net activity from stock option and incentive plan, shares   34,000            
Net activity from stock option and incentive plan, value 37,292     3,899       33,393
Contributions from noncontrolling interests in property partnerships 161,585             161,585
Distributions to noncontrolling interests in property partnerships (54,176)             (54,176)
Effective portion of interest rate contracts (6,133)           (3,305) (2,828)
Amortization of interest rate contracts 6,033           5,127 906
Reallocation of noncontrolling interest 0     22,879       (22,879)
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]                
Cumulative effect of a change in accounting principle $ 5,496       4,933     563
Redemption of operating partnership units to common stock   83,000            
Redemption of operating partnership units to common stock 0 $ 2   2,878       (2,880)
Allocated net income for the year 712,563       582,847     129,716
Dividends/distributions declared (613,702)       (550,971)     (62,731)
Shares issued pursuant to stock purchase plan, shares   6,000            
Shares issued pursuant to stock purchase plan, value 797     797        
Net activity from stock option and incentive plan, shares   44,000            
Net activity from stock option and incentive plan, value 38,590     1,729       36,861
Contributions from noncontrolling interests in property partnerships 46,701             46,701
Distributions to noncontrolling interests in property partnerships (82,501)             (82,501)
Effective portion of interest rate contracts (3,096)           (2,781) (315)
Amortization of interest rate contracts 6,664           5,469 1,195
Reallocation of noncontrolling interest 0     24,311       (24,311)
Equity, value at Dec. 31, 2018 $ 8,213,968 $ 1,545 $ 200,000 $ 6,407,623 $ (675,534) $ (2,722) $ (47,741) $ 2,330,797
Equity, shares at Dec. 31, 2018 154,458,478 154,458,000