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Summary of Significant Accounting Policies (Calculation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accounting Policies [Abstract]
Net income	$ 91,769	$ 81,005	$ 180,506	$ 158,502
Shares used to compute basic earnings per common share	158,325	161,795	158,708	162,404
Dilutive effect of stock options	3,384	3,293	3,518	3,212
Shares used to compute diluted earnings per common share	161,709	165,088	162,226	165,616
Basic earnings per common share	$ 0.58	$ 0.50	$ 1.14	$ 0.98
Diluted earnings per common share	$ 0.57	$ 0.49	$ 1.11	$ 0.96

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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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