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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, 2014 $ 7,902,936 $ 1,531 $ 200,000 $ 6,270,257 $ (762,464) $ (2,722) $ (9,304) $ 2,205,638
Equity, shares at Dec. 31, 2014   153,114,000            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Conversion of operating partnership units to Common Stock, shares   419,000            
Conversion of operating partnership units to Common Stock, value 0 $ 5   14,152       (14,157)
Allocated net income for the year 628,053       442,556     185,497
Dividends/distributions declared (342,453)       (307,146)      
Dividends/distributions declared               (35,307)
Shares issued pursuant to stock purchase plan, shares   6,000            
Shares issued pursuant to stock purchase plan, value 780     780        
Net activity from stock option and incentive plan, shares   36,000            
Net activity from stock option and incentive plan, value 33,907 $ 0   4,600       29,307
Acquisition of redeemable noncontrolling interest in property partnership (1,586)     (1,586)        
Contributions from noncontrolling interests in property partnerships 1,758             1,758
Distributions to noncontrolling interests in property partnerships (144,468)             (144,468)
Effective portion of interest rate contracts (18,050)           (13,008) (5,042)
Amortization of interest rate contracts 1,882           1,687 195
Reallocation of noncontrolling interest 0     12,577       (12,577)
Equity, value at Sep. 30, 2015 8,062,759 $ 1,536 200,000 6,300,780 (627,054) (2,722) (20,625) 2,210,844
Equity, shares at Sep. 30, 2015   153,575,000            
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 153,579,966 153,580,000            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Conversion of operating partnership units to Common Stock, shares   173,000            
Conversion of operating partnership units to Common Stock, value   $ 2   5,879       (5,881)
Allocated net income for the year $ 405,083       362,910     42,173
Dividends/distributions declared (342,980)       (307,480)      
Dividends/distributions declared               (35,500)
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   14,000            
Net activity from stock option and incentive plan, value 24,290     2,870       21,420
Sale of interests in property partnerships       1,320       (1,320)
Contributions from noncontrolling interests in property partnerships 6,737             6,737
Distributions to noncontrolling interests in property partnerships (38,694)             (38,694)
Effective portion of interest rate contracts (85,285)           (62,022) (23,263)
Amortization of interest rate contracts 2,445           2,193 252
Reallocation of noncontrolling interest       10,094       (10,094)
Equity, value at Sep. 30, 2016 $ 7,859,253 $ 1,538 $ 200,000 $ 6,326,580 $ (725,522) $ (2,722) $ (73,943) $ 2,133,322
Equity, shares at Sep. 30, 2016 153,773,012 153,773,000