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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Changes in equity        
Beginning Balance     $ 10,388,046  
Net income attributable to common stockholders $ 254,662 $ 165,225 396,305 $ 401,100
(Loss) gain on cash flow hedges     11,499  
Cash flow hedge losses reclassified to earnings 1,455 $ 1,781 3,213 3,534
Change in redemption value of redeemable noncontrolling interest     (354)  
Dividends declared to common stockholders     (406,638)  
Issuance of common stock, net of withholdings     (10,514)  
Amortization of deferred compensation     16,631  
Ending Balance 10,398,188   10,398,188  
Common stock        
Changes in equity        
Beginning Balance     1,381  
Issuance of common stock, net of withholdings     1  
Ending Balance 1,382   1,382  
Additional paid-in capital        
Changes in equity        
Beginning Balance     10,235,475  
Issuance of common stock, net of withholdings     (11,659)  
Amortization of deferred compensation     16,631  
Ending Balance 10,240,447   10,240,447  
Accumulated earnings less dividends        
Changes in equity        
Beginning Balance     188,609  
Net income attributable to common stockholders     396,305  
Change in redemption value of redeemable noncontrolling interest     (354) $ 397
Dividends declared to common stockholders     (406,638)  
Issuance of common stock, net of withholdings     1,144  
Ending Balance 179,066   179,066  
Accumulated other comprehensive loss        
Changes in equity        
Beginning Balance     (37,419)  
(Loss) gain on cash flow hedges     11,499  
Cash flow hedge losses reclassified to earnings     3,213  
Ending Balance $ (22,707)   $ (22,707)  
Continuous Equity Program CEP IV        
Class of Stock [Line Items]        
Stock Issued During Period, Shares, New Issues 0   0