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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
Mar. 31, 2017
Mar. 31, 2016
Accounting Policies [Abstract]    
Net income $ 88,737 $ 77,497
Shares used to compute basic earnings per common share 159,091 163,013
Dilutive effect of stock options 3,651 3,132
Shares used to compute diluted earnings per common share 162,742 166,145
Basic earnings per common share $ 0.56 $ 0.48
Diluted earnings per common share $ 0.55 $ 0.47