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Stock-Based Compensation Plans (Schedule Of Comparative Data For Stocks Option, Stock Awards And PSUs) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock-Based Compensation Plans [Abstract]      
Total compensation expense of stock-based compensation plans charged against income $ 21,338 $ 19,229 $ 16,256
Total income tax benefit recognized in income for stock based compensation expense charged against income 5,373 4,788 5,690
Total intrinsic value of stock options exercised 106,793 102,144 50,192
Total intrinsic value of stock awards vested during the period $ 767 $ 4,003 $ 6,983
Per-share weighted average grant-date fair value of stock awards granted $ 331.69 $ 333.75 $ 203.52