Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share, Diluted , By Common Class [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	6,000	0	6,000	0
Numerator for Basic and Diluted Earnings Per Share - [Abstract]
Net Income	$ 847,841	$ 696,731	$ 1,483,267	$ 1,335,320
Denominator for Basic Earnings Per Share - [Abstract]
Weighted Average Shares	577,460	576,135	577,333	575,953
Denominator for Diluted Earnings Per Share - [Abstract]
Adjusted Diluted Weighted Average Shares	580,247	580,375	580,204	580,007
Net Income Per Share
Basic	$ 1.47	$ 1.21	$ 2.57	$ 2.32
Diluted	$ 1.46	$ 1.20	$ 2.56	$ 2.30
Stock Options And SARs
Potential Dilutive Common Shares - [Abstract]
Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangments	434	1,365	452	1,237
Restricted Stock/Units and Performance Units/Stock [Member]
Potential Dilutive Common Shares - [Abstract]
Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangments	2,353	2,875	2,419	2,817

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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