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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator for Basic and Diluted Earnings Per Share - [Abstract]    
Net Income $ 635,426 $ 638,589
Denominator for Basic Earnings Per Share - [Abstract]    
Weighted Average Shares 577,207 575,775
Denominator for Diluted Earnings Per Share - [Abstract]    
Adjusted Diluted Weighted Average Shares 580,222 579,726
Antidilutive Securities Excluded from Computation of Earnings Per Share [Abstract]    
Anti-dilutive Securities excluded from Diluted Earnings Per Share Calculation 4,900 200
Net Income Per Share    
Basic $ 1.10 $ 1.11
Diluted $ 1.10 $ 1.10
Stock Options And SARs    
Potential Dilutive Common Shares - [Abstract]    
Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangments 472 1,217
Restricted Stock/Units and Performance Units/Stock [Member]    
Potential Dilutive Common Shares - [Abstract]    
Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangments 2,543 2,734