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Earnings Per Share (Reconciliation of the Numerators and Denominators of the Basic and Diluted Per Shares) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income (numerator for basic and diluted calculations)	$ 301,199	$ 227,591	$ 605,803	$ 605,293
Shares:
Weighted average outstanding shares (denominator for basic calculation)	63,279	64,488	63,941	64,430
Equivalent shares from outstanding stock options	1,017	1,165	1,189	1,174
Denominator for diluted calculation	64,296	65,653	65,130	65,604
Earnings Per Share:
Basic earnings per share	$ 4.76	$ 3.53	$ 9.47	$ 9.39
Diluted earnings per share	$ 4.68	$ 3.47	$ 9.30	$ 9.23

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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