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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Options, Granted | 315,555 | 312,598 | 326,806
Weighted Average Grant-Date Price, Granted | $ 545.69 | $ 496.25 | $ 482.66
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Options, Outstanding at January 1, 2020 | 1,181,154 |  |
Number of Options, Granted | 315,555 |  |
Number of Options, Exercised/Vested | (370,105) |  |
Number of Options, Canceled/Forfeited | (9,381) |  |
Number of Options, Outstanding at December 31, 2020 | 1,117,223 | 1,181,154 |
Number of Options, Vested and expected to vest at December 31, 2020 | 1,117,223 |  |
Number of Options, Exercisable at December 31, 2020 | 494,064 |  |
Weighted Average Exercise Price, Outstanding at January 1, 2020 | $ 432.75 |  |
Weighted Average Exercise Price, Granted | 509.46 |  |
Weighted Average Exercise Price, Exercised/Vested | 406.45 |  |
Weighted Average Exercise Price, Canceled/Forfeited | 455.42 |  |
Weighted Average Exercise Price, Outstanding at December 31, 2020 | 462.94 | $ 432.75 |
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2020 | 462.94 |  |
Weighted Average Exercise Price, Exercisable at December 31, 2020 | $ 437.24 |  |
Weighted Average Remaining Contractual Life (Years), Outstanding at December 31, 2020 | 3 years 3 months 18 days |  |
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest at December 31, 2020 | 3 years 3 months 18 days |  |
Weighted Average Remaining Contractual Life (Years), Exercisable at December 31, 2020 | 2 years 2 months 12 days |  |
Aggregate Intrinsic Value, Outstanding at December 31, 2020 | $ 134,531 |  |
Aggregate Intrinsic Value, Vested and expected to vest at December 31, 2020 | 134,531 |  |
Aggregate Intrinsic Value, Exercisable at December 31, 2020 | $ 72,191 |  |
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 | 2,646 |  |
Number of Awards, Exercised/Vested | (2,646) |  |
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 | 545.69 |  |
Weighted Average Grant-Date Price, Exercised/Vested | 545.69 |  |
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 | 37,490 |  |
Number of Nonvested Target Units, Granted | 21,802 |  |
Number of Nonvested Target Units, Exercised/Vested | (15,138) |  |
Number of Nonvested Target Units, Outstanding at December 31, 2020 | 44,154 | 37,490 |
Number of Nonvested Target Units, Vested and expected to vest at December 31, 2020 | 49,231 |  |
Weighted Average Grant-Date Price, Outstanding at January 1, 2020 | $ 543.11 |  |
Weighted Average Grant-Date Price, Granted | 557.23 |  |
Weighted Average Grant-Date Price, Exercised/Vested | 544.36 |  |
Weighted Average Grant-Date Price, Outstanding at December 31, 2020 | 549.65 | $ 543.11 |
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2020 | $ 546.47 |  |

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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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