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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 128,737	$ 132,168	$ 126,540	$ 113,981	$ 116,034	$ 128,319	$ 121,677	$ 139,838	$ 501,426	$ 505,868	$ 404,389
Shares used to compute basic earnings per common share (in shares)									151,540	156,579	158,177
Dilutive effect of stock options (in shares)									3,361	4,653	4,092
Shares used to compute diluted earnings per common share (in shares)									154,901	161,232	162,269
Basic earnings per common share (in USD per share)	$ 0.86	$ 0.88	$ 0.83	$ 0.74	$ 0.75	$ 0.82	$ 0.77	$ 0.89	$ 3.31	$ 3.23	$ 2.56
Diluted earnings per common share (in USD per share)	$ 0.84	$ 0.86	$ 0.82	$ 0.73	$ 0.73	$ 0.80	$ 0.75	$ 0.86	$ 3.24	$ 3.14	$ 2.49

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