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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator for Basic and Diluted Earnings Per Share - [Abstract]        
Net Income $ 696,731 $ 23,053 $ 1,335,320 $ 51,570
Denominator for Basic Earnings Per Share - [Abstract]        
Weighted Average Shares 576,135 574,439 575,953 574,162
Denominator for Diluted Earnings Per Share - [Abstract]        
Adjusted Diluted Weighted Average Shares 580,375 578,483 580,007 578,573
Antidilutive Securities Excluded from Computation of Earnings Per Share [Abstract]        
Anti-dilutive Securities excluded from Diluted Earnings Per Share Calculation 0 3,400 0 2,000
Net Income Per Share        
Basic $ 1.21 $ 0.04 $ 2.32 $ 0.09
Diluted $ 1.20 $ 0.04 $ 2.30 $ 0.09
Stock Options And SARs [Member]        
Potential Dilutive Common Shares - [Abstract]        
Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangments 1,365 1,452 1,237 1,669
Restricted Stock/Units and Performance Units/Stock [Member]        
Potential Dilutive Common Shares - [Abstract]        
Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangments 2,875 2,592 2,817 2,742