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Stock-Based Compensation Plans (Schedule Of Total Stock Option, Stock Award And PSU Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Options, Granted | 287,010 | 246,350 | 330,550
Weighted Average Grant-Date Price, Granted | $ 331.69 | $ 333.75 | $ 203.52
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Options, Outstanding at January 1, 2019 | 1,395,034 |  |
Number of Options, Granted | 287,010 |  |
Number of Options, Exercised/Vested | (464,661) |  |
Number of Options, Canceled/Forfeited | (11,435) |  |
Number of Options, Outstanding at December 31, 2019 | 1,205,948 | 1,395,034 |
Number of Options, Vested and expected to vest at December 31, 2019 | 1,205,948 |  |
Number of Options, Exercisable at December 31, 2019 | 654,424 |  |
Weighted Average Exercise Price, Outstanding at January 1, 2019 | $ 181.82 |  |
Weighted Average Exercise Price, Granted | 413.19 |  |
Weighted Average Exercise Price, Exercised/Vested | 139.78 |  |
Weighted Average Exercise Price, Canceled/Forfeited | 215.86 |  |
Weighted Average Exercise Price, Outstanding at December 31, 2019 | 252.77 | $ 181.82 |
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2019 | 252.77 |  |
Weighted Average Exercise Price, Exercisable at December 31, 2019 | $ 172.20 |  |
Weighted Average Remaining Contractual Life (Years), Outstanding at December 31, 2019 | 3 years 3 months 18 days |  |
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest at December 31, 2019 | 3 years 3 months 18 days |  |
Weighted Average Remaining Contractual Life (Years), Exercisable at December 31, 2019 | 2 years 7 months 6 days |  |
Aggregate Intrinsic Value, Outstanding at December 31, 2019 | $ 225,226 |  |
Aggregate Intrinsic Value, Vested and dxpected to vest at December 31, 2019 | 225,226 |  |
Aggregate Intrinsic Value, Exercisable at December 31, 2019 | $ 174,949 |  |
Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Awards, Outstanding at January 1, 2019 |  |  |
Number of Awards, Granted | 2,313 |  |
Number of Awards, Exercised/Vested | (2,313) |  |
Number of Awards, Canceled/ Forfeited |  |  |
Number of Awards, Outstanding at December 31, 2019 |  |  |
Number of Awards, Vested and expected to vest at December 31, 2019 |  |  |
Weighted Average Grant-Date Price, Outstanding at January 1, 2019 |  |  |
Weighted Average Grant-Date Price, Granted | 331.69 |  |
Weighted Average Grant-Date Price, Exercised/Vested | 331.69 |  |
Weighted Average Grant-Date Price, Canceled/Forfeited |  |  |
Weighted Average Grant-Date Price, Outstanding at December 31, 2019 |  |  |
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2019 |  |  |
Perfromance Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Nonvested Target Units, Outstanding at January 1, 2019 | 48,160 |  |
Number of Nonvested Target Units, Granted | 27,688 |  |
Number of Nonvested Target Units, Exercised/Vested | (32,136) |  |
Number of Nonvested Target Units, Canceled/Forfeited | (734) |  |
Number of Nonvested Target Units, Outstanding at December 31, 2019 | 42,978 | 48,160 |
Number of Nonvested Target Units, Vested and expected to vest at December 31, 2019 | 82,603 |  |
Weighted Average Grant-Date Price, Outstanding at January 1, 2019 | $ 207.17 |  |
Weighted Average Grant-Date Price, Granted | 253.44 |  |
Weighted Average Grant-Date Price, Exercised/Vested | 136.48 |  |
Weighted Average Grant-Date Price, Canceled/Forfeited | 269.08 |  |
Weighted Average Grant-Date Price, Outstanding at December 31, 2019 | 288.78 | $ 207.17 |
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2019 | $ 290.11 |  |

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