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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Options, Granted | 326,806 | 298,670 | 287,010
Weighted Average Grant-Date Price, Granted | $ 482.66 | $ 466.43 | $ 331.69
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Options, Outstanding at January 1, 2020 | 1,070,071 |  |
Number of Options, Granted | 326,806 |  |
Number of Options, Exercised/Vested | (226,268) |  |
Number of Options, Canceled/Forfeited | (16,572) |  |
Number of Options, Outstanding at December 31, 2020 | 1,154,037 | 1,070,071 |
Number of Options, Vested and expected to vest at December 31, 2020 | 1,154,037 |  |
Number of Options, Exercisable at December 31, 2020 | 545,359 |  |
Weighted Average Exercise Price, Outstanding at January 1, 2020 | $ 341.99 |  |
Weighted Average Exercise Price, Granted | 445.35 |  |
Weighted Average Exercise Price, Exercised/Vested | 228.74 |  |
Weighted Average Exercise Price, Canceled/Forfeited | 411.46 |  |
Weighted Average Exercise Price, Outstanding at December 31, 2020 | 392.46 | $ 341.99 |
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2020 | 392.46 |  |
Weighted Average Exercise Price, Exercisable at December 31, 2020 | $ 329.13 |  |
Weighted Average Remaining Contractual Life (Years), Outstanding at December 31, 2020 | 3 years 4 months 24 days |  |
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest at December 31, 2020 | 3 years 4 months 24 days |  |
Weighted Average Remaining Contractual Life (Years), Exercisable at December 31, 2020 | 2 years 6 months |  |
Aggregate Intrinsic Value, Outstanding at December 31, 2020 | $ 160,200 |  |
Aggregate Intrinsic Value, Vested and dxpected to vest at December 31, 2020 | 160,200 |  |
Aggregate Intrinsic Value, Exercisable at December 31, 2020 | $ 110,246 |  |
Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Awards, Outstanding at January 1, 2020 |  |  |
Number of Awards, Granted | 2,430 |  |
Number of Awards, Exercised/Vested | (2,430) |  |
Number of Awards, Canceled/ Forfeited |  |  |
Number of Awards, Outstanding at December 31, 2020 |  |  |
Number of Awards, Vested and expected to vest at December 31, 2020 |  |  |
Weighted Average Grant-Date Price, Outstanding at January 1, 2020 |  |  |
Weighted Average Grant-Date Price, Granted | 482.66 |  |
Weighted Average Grant-Date Price, Exercised/Vested | 482.66 |  |
Weighted Average Grant-Date Price, Canceled/Forfeited |  |  |
Weighted Average Grant-Date Price, Outstanding at December 31, 2020 |  |  |
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2020 |  |  |
Performance Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Nonvested Target Units, Outstanding at January 1, 2020 | 38,196 |  |
Number of Nonvested Target Units, Granted | 24,615 |  |
Number of Nonvested Target Units, Exercised/Vested | (26,521) |  |
Number of Nonvested Target Units, Canceled/Forfeited | (456) |  |
Number of Nonvested Target Units, Outstanding at December 31, 2020 | 35,834 | 38,196 |
Number of Nonvested Target Units, Vested and expected to vest at December 31, 2020 | 55,984 |  |
Weighted Average Grant-Date Price, Outstanding at January 1, 2020 | $ 396.93 |  |
Weighted Average Grant-Date Price, Granted | 419.79 |  |
Weighted Average Grant-Date Price, Exercised/Vested | 294.43 |  |
Weighted Average Grant-Date Price, Canceled/Forfeited | 491.77 |  |
Weighted Average Grant-Date Price, Outstanding at December 31, 2020 | 487.29 | $ 396.93 |
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2020 | $ 463.76 |  |

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