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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income (numerator for basic and diluted calculations)	$ 204,374	$ 232,190	$ 304,604	$ 377,702
Shares:
Weighted average outstanding shares (denominator for basic calculation)	64,071	64,449	64,278	64,401
Equivalent shares from outstanding stock options	1,179	1,159	1,277	1,204
Denominator for diluted calculation	65,250	65,608	65,555	65,605
Earnings Per Share:
Basic earnings per share	$ 3.19	$ 3.60	$ 4.74	$ 5.86
Diluted earnings per share	$ 3.13	$ 3.54	$ 4.65	$ 5.76

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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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