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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]                      
Net income $ 125,882 $ 111,096 $ 101,066 $ 109,242 $ 128,737 $ 132,168 $ 126,540 $ 113,981 $ 447,286 $ 501,426 $ 505,868
Shares used to compute basic earnings per common share (in shares)                 146,709 151,540 156,579
Dilutive effect of stock options (in shares)                 2,294 3,361 4,653
Shares used to compute diluted earnings per common share (in shares)                 149,003 154,901 161,232
Basic earnings per common share (in USD per share) $ 0.87 $ 0.76 $ 0.69 $ 0.73 $ 0.86 $ 0.88 $ 0.83 $ 0.74 $ 3.05 $ 3.31 $ 3.23
Diluted earnings per common share (in USD per share) $ 0.86 $ 0.75 $ 0.68 $ 0.72 $ 0.84 $ 0.86 $ 0.82 $ 0.73 $ 3.00 $ 3.24 $ 3.14