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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income									$ 505,868	$ 404,389	$ 333,817
Shares used to compute basic earnings per common share									156,579	158,177	161,350
Dilutive effect of stock options									4,653	4,092	3,081
Shares used to compute diluted earnings per common share									161,232	162,269	164,431
Basic earnings per common share (in USD per share)	$ 0.75	$ 0.82	$ 0.77	$ 0.89	$ 0.78	$ 0.64	$ 0.58	$ 0.56	$ 3.23	$ 2.56	$ 2.07
Diluted earnings per common share (in USD per share)	$ 0.73	$ 0.80	$ 0.75	$ 0.86	$ 0.75	$ 0.63	$ 0.57	$ 0.55	$ 3.14	$ 2.49	$ 2.03

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