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Share-Based Compensation (Schedule Of Stock Option Activity) (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Number of Shares |  |  |
Options outstanding, beginning (in shares) | 1,652,505 | 1,033,838 | 1,004,014
Options outstanding, December 31 (in shares) | 2,216,175 | 1,652,505 | 1,033,838
Options exercisable, December 31 (in shares) | 1,701,155 |  |
Weighted Average Grant Date Fair Value |  |  |
Outstanding, January 1 (in usd per share) | $ 78.10 | $ 83.54 | $ 74.35
Outstanding, December 31 (in usd per share) | 70.97 | $ 78.10 | $ 83.54
Exercisable, December 31 (in usd per share) | $ 74.78 |  |
Weighted Average Remaining Contractual Life (Years) |  |  |
Options outstanding, December 31, 2022 | 2 years 9 months 21 days |  |
Exercisable at December 31, 2022 | 2 years 6 months |  |
2012 Plan |  |  |
Number of Shares |  |  |
Options granted (in shares) |  | 12,500 | 319,669
Options exercised (in shares) |  | (20,000) | (512,509)
Options forfeited (in shares) | (23,000) |  | (16,669)
Weighted Average Grant Date Fair Value |  |  |
Granted (in usd per share) |  | $ 69.20 | $ 90.79
Exercised (in usd per share) |  | $ 60.52 | 72.98
Forfeited (in usd per share) | $ 62.33 |  | $ 81.37
2019 Stock Option Plan |  |  |
Number of Shares |  |  |
Options granted (in shares) | 718,000 | 639,500 | 272,331
Options exercised (in shares) | (56,832) |  |
Options forfeited (in shares) |  | (13,333) | (32,998)
Options expired (in shares) | (74,498) |  |
Weighted Average Grant Date Fair Value |  |  |
Granted (in usd per share) | $ 53.62 | $ 69.20 | $ 89.76
Exercised (in usd per share) | 53.41 |  |
Forfeited (in usd per share) | $ 77.93 | $ 90.79 | $ 90.79
Grant Date 2-20-2018 |  |  |
Number of Shares |  |  |
Options outstanding, December 31 (in shares) | 88,170 |  |
Weighted Average Grant Date Fair Value |  |  |
Outstanding, December 31 (in usd per share) | $ 64.33 |  |
Weighted Average Remaining Contractual Life (Years) |  |  |
Options outstanding, December 31, 2022 | 1 month 20 days |  |
Grant Date 2-21-2019 |  |  |
Number of Shares |  |  |
Options outstanding, December 31 (in shares) | 306,837 |  |
Weighted Average Grant Date Fair Value |  |  |
Outstanding, December 31 (in usd per share) | $ 79.96 |  |
Weighted Average Remaining Contractual Life (Years) |  |  |
Options outstanding, December 31, 2022 | 1 year 1 month 20 days |  |
Grant Date 2-21-2020 |  |  |
Number of Shares |  |  |
Options outstanding, December 31 (in shares) | 523,500 |  |
Weighted Average Grant Date Fair Value |  |  |
Outstanding, December 31 (in usd per share) | $ 90.79 |  |
Weighted Average Remaining Contractual Life (Years) |  |  |
Options outstanding, December 31, 2022 | 2 years 1 month 24 days |  |
Grant Date 5-1-2020 |  |  |
Number of Shares |  |  |
Options outstanding, December 31 (in shares) | 7,500 |  |
Weighted Average Grant Date Fair Value |  |  |
Outstanding, December 31 (in usd per share) | $ 53.76 |  |
Weighted Average Remaining Contractual Life (Years) |  |  |
Options outstanding, December 31, 2022 | 2 years 3 months 29 days |  |
Grant date 2-25-2021 |  |  |
Number of Shares |  |  |
Options outstanding, December 31 (in shares) | 639,000 |  |
Weighted Average Grant Date Fair Value |  |  |
Outstanding, December 31 (in usd per share) | $ 69.20 |  |
Weighted Average Remaining Contractual Life (Years) |  |  |
Options outstanding, December 31, 2022 | 3 years 1 month 28 days |  |
Grant date 2-25-2022 |  |  |
Number of Shares |  |  |
Options outstanding, December 31 (in shares) | 626,168 |  |
Weighted Average Grant Date Fair Value |  |  |
Outstanding, December 31 (in usd per share) | $ 53.41 |  |
Weighted Average Remaining Contractual Life (Years) |  |  |
Options outstanding, December 31, 2022 | 4 years 1 month 28 days |  |
Grant date 6-1-2022 |  |  |
Number of Shares |  |  |
Options outstanding, December 31 (in shares) | 25,000 |  |
Weighted Average Grant Date Fair Value |  |  |
Outstanding, December 31 (in usd per share) | $ 59.43 |  |
Weighted Average Remaining Contractual Life (Years) |  |  |
Options outstanding, December 31, 2022 | 4 years 5 months 1 day |  |

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