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Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Class of Stock [Line Items]                
Issuance of common stock, net             $ 207,789 $ 1,224
Changes in equity                
Beginning Balance $ 10,750,530 $ 10,733,999 $ 10,632,606 $ 10,398,188 $ 10,335,124 $ 10,388,046 10,632,606 10,388,046
Net income attributable to common stockholders 279,677 168,281 170,366 192,486 254,662 141,643 618,324 588,791
(Loss) gain on cash flow hedges (13,644) (2,888) (7,231) 0   11,501 (23,763) 11,499
Cash flow hedge losses reclassified to earnings 1,746 1,611 1,468 1,466 1,455 1,756 4,825 4,679
Change in redemption value of redeemable noncontrolling interest (113) (45) (224) (272) (291) (63)    
Noncontrolling interest contribution 118 530            
Dividends declared to common stockholders ($1.52 per share) (212,526) (212,549) (212,166) (203,334) (203,472) (203,166)    
Issuance of common stock, net of withholdings (717) 50,806 141,319 442 628 (11,142)    
Amortization of deferred compensation 10,002 10,785 7,861 8,422 10,082 6,549    
Ending Balance $ 10,815,073 $ 10,750,530 $ 10,733,999 $ 10,397,398 $ 10,398,188 $ 10,335,124 10,815,073 10,397,398
Dividends declared to common stockholders (in dollars per share) $ 1.52 $ 1.52 $ 1.52 $ 1.47 $ 1.47 $ 1.47    
Common stock                
Changes in equity                
Beginning Balance $ 1,397 $ 1,394 $ 1,385 $ 1,382 $ 1,382 $ 1,381 1,385 1,381
Issuance of common stock, net of withholdings   3 9     1    
Ending Balance 1,397 1,397 1,394 1,382 1,382 1,382 1,397 1,382
Additional paid-in capital                
Changes in equity                
Beginning Balance 10,519,239 10,457,651 10,306,588 10,240,447 10,229,738 10,235,475 10,306,588 10,235,475
Issuance of common stock, net of withholdings (454) 50,803 143,202 442 627 (12,286)    
Amortization of deferred compensation 10,002 10,785 7,861 8,422 10,082 6,549    
Ending Balance 10,528,787 10,519,239 10,457,651 10,249,311 10,240,447 10,229,738 10,528,787 10,249,311
Accumulated earnings less dividends                
Changes in equity                
Beginning Balance 262,548 306,861 350,777 179,066 128,166 188,609 350,777 188,609
Net income attributable to common stockholders 279,677 168,281 170,366 192,486 254,662 141,643    
Change in redemption value of redeemable noncontrolling interest (113) (45) (224) (272) (291) (63) (382) (626)
Dividends declared to common stockholders ($1.52 per share) (212,526) (212,549) (212,166) 203,334 203,472 (203,166)    
Issuance of common stock, net of withholdings (263)   (1,892)   1 1,143    
Ending Balance 329,323 262,548 306,861 167,946 179,066 128,166 329,323 167,946
Accumulated other comprehensive loss                
Changes in equity                
Beginning Balance (33,184) (31,907) (26,144) (22,707) (24,162) (37,419) (26,144) (37,419)
(Loss) gain on cash flow hedges (13,644) (2,888) (7,231)     11,501    
Cash flow hedge losses reclassified to earnings 1,746 1,611 1,468 (1,466) (1,455) 1,756    
Ending Balance (45,082) (33,184) (31,907) $ (21,241) $ (22,707) $ (24,162) (45,082) $ (21,241)
Parent [Member]                
Changes in equity                
Beginning Balance 10,750,000 10,733,999 10,632,606       10,632,606  
Net income attributable to common stockholders 279,677 168,281 170,366          
(Loss) gain on cash flow hedges (13,644) (2,888) (7,231)          
Cash flow hedge losses reclassified to earnings 1,746 1,611 1,468          
Change in redemption value of redeemable noncontrolling interest (113) (45) (224)          
Dividends declared to common stockholders ($1.52 per share) (212,526) (212,549) (212,166)          
Issuance of common stock, net of withholdings (717) 50,806 141,319          
Amortization of deferred compensation 10,002 10,785 7,861          
Ending Balance 10,814,425 10,750,000 10,733,999       10,814,425  
Noncontrolling Interest [Member]                
Changes in equity                
Beginning Balance 530 0 0       0  
Noncontrolling interest contribution 118 530            
Ending Balance 648 $ 530 $ 0       648  
Continuous Equity Program CEP IV                
Class of Stock [Line Items]                
Issuance of common stock, net $ 0           $ 147,450