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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]                      
Net income                 $ 333,817 $ 331,655 $ 318,713
Shares used to compute basic earnings per common share                 161,350 165,725 168,246
Dilutive effect of stock options                 3,081 3,873 4,319
Shares used to compute diluted earnings per common share                 164,431 169,598 172,565
Basic earnings per common share $ 0.55 $ 0.54 $ 0.50 $ 0.48 $ 0.49 $ 0.48 $ 0.52 $ 0.51 $ 2.07 $ 2.00 $ 1.89
Diluted earnings per common share $ 0.55 $ 0.53 $ 0.49 $ 0.47 $ 0.48 $ 0.47 $ 0.51 $ 0.50 $ 2.03 $ 1.96 $ 1.85