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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								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income									$ 404,389	$ 333,817	$ 331,655
Shares used to compute basic earnings per common share									158,177	161,350	165,725
Dilutive effect of stock options									4,092	3,081	3,873
Shares used to compute diluted earnings per common share									162,269	164,431	169,598
Basic earnings per common share	$ 0.78	$ 0.64	$ 0.58	$ 0.56	$ 0.55	$ 0.54	$ 0.50	$ 0.48	$ 2.56	$ 2.07	$ 2.00
Diluted earnings per common share	$ 0.75	$ 0.63	$ 0.57	$ 0.55	$ 0.55	$ 0.53	$ 0.49	$ 0.47	$ 2.49	$ 2.03	$ 1.96

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