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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-Based Compensation Plans [Abstract] |
Company's Shareholder Approved Plans |
|  |  |  |  | Weighted- |  |
|  |  | Weighted- |  | Average |  |
|  |  | Average |  | Remaining |  | Aggregate
(Aggregate Intrinsic Value in thousands) |  |  | Exercise |  | Contractual |  | Intrinsic
Options | Shares |  | Price/Share |  | Term |  | Value
Outstanding at January 1, 2019 | 279,164 |  | $ | 83.84 |  |  |  |  |
Granted | – |  |  | - |  |  |  |  |
Exercised | 108,460 |  |  | 78.58 |  |  |  |  |
Forfeited/Cancelled/Expired | – |  |  | - |  |  |  |  |
Outstanding at December 31, 2019 | 170,704 |  |  | 87.18 |  | 1.4 |  | $ | 32,376
|  |  |  | . |  |  |  |  |
Exercisable at December 31, 2019 | 170,704 |  |  | 87.18 |  | 1.4 |  | $ | 32,376
|  |  |  |  | Weighted- |  |
|  |  | Weighted- |  | Average |  |
|  |  | Average |  | Remaining |  | Aggregate
(Aggregate Intrinsic Value in thousands) |  |  | Exercise |  | Contractual |  | Intrinsic
Options | Shares |  | Price/Share |  | Term |  | Value
Outstanding at January 1, 2018 | 360,364 |  | $ | 84.10 |  |  |  |  |
Granted | - |  |  | - |  |  |  |  |
Exercised | 81,200 |  |  | 84.99 |  |  |  |  |
Forfeited/Cancelled/Expired | - |  |  | - |  |  |  |  |
Outstanding at December 31, 2018 | 279,164 |  |  | 83.84 |  | 1.9 |  | $ | 37,386
Exercisable at December 31, 2018 | 279,164 |  |  | 83.84 |  | 1.9 |  | $ | 37,386
|  |  |  |  | Weighted- |  |
|  |  | Weighted- |  | Average |  |
|  |  | Average |  | Remaining |  | Aggregate
(Aggregate Intrinsic Value in thousands) |  |  | Exercise |  | Contractual |  | Intrinsic
Options | Shares |  | Price/Share |  | Term |  | Value
Outstanding at January 1, 2017 | 454,994 |  | $ | 84.88 |  |  |  |  |
Granted | - |  |  | - |  |  |  |  |
Exercised | 94,630 |  |  | 87.84 |  |  |  |  |
Forfeited/Cancelled/Expired | - |  |  | - |  |  |  |  |
Outstanding at December 31, 2017 | 360,364 |  |  | 84.10 |  | 2.7 |  | $ | 49,428
Exercisable at December 31, 2017 | 360,364 |  |  | 84.10 |  | 2.7 |  | $ | 49,428
Share Options Outstanding And Exercisable |
| At December 31, 2019
| Options Outstanding |  | Opotions Exercisable
|  |  | Weighted- |  |  |  |  |  |
|  |  | Average |  | Weighted- |  |  |  | Weighted-
| Number |  | Remaining |  | Average |  | Number |  | Average
Range of | Outstanding |  | Contractual |  | Exercise |  | Exercisable |  | Exercise
Exercise Prices | at 12/31/19 |  | Life |  | Price |  | at 12/31/19 |  | Price
$84.6300 - $85.6300 | 31,100 |  | 0.2 |  | $ | 84.63 |  | 31,100 |  | $ | 84.63
$85.6400 - $87.4700 | 59,900 |  | 1.2 |  |  | 86.62 |  | 59,900 |  |  | 86.62
$87.4800 - $89.4100 | 73,750 |  | 2.1 |  |  | 88.32 |  | 73,750 |  |  | 88.32
$89.4200 - $110.1300 | 5,954 |  | 1.5 |  |  | 91.99 |  | 5,954 |  |  | 91.99
| 170,704 |  | 1.4 |  |  | 87.18 |  | 170,704 |  |  | 87.18
Summary Of Company's Non-Vested Shares And Changes |
| Years Ended December 31,
| 2019 |  | 2018 |  | 2017
|  |  | Weighted- |  |  |  | Weighted- |  |  |  | Weighted-
|  |  | Average |  |  |  | Average |  |  |  | Average
|  |  | Grant Date |  |  |  | Grant Date |  |  |  | Grant Date
Restricted (non-vested) Shares | Shares |  | Fair Value |  | Shares |  | Fair Value |  | Shares |  | Fair Value
Outstanding at January 1, | 414,407 |  | $ | 217.15 |  | 421,261 |  | $ | 194.01 |  | 435,338 |  | $ | 164.21
Granted | 232,601 |  |  | - |  | 173,065 |  |  | 240.59 |  | 160,185 |  |  | 234.01
Vested | 138,322 |  |  | - |  | 141,982 |  |  | 178.31 |  | 152,397 |  |  | 151.80
Forfeited | 13,549 |  |  | - |  | 37,937 |  |  | 212.48 |  | 21,865 |  |  | 187.82
Outstanding at December 31, | 495,137 |  |  | - |  | 414,407 |  |  | 217.15 |  | 421,261 |  |  | 194.01
Company's Non-Vested Performance Share Unit Awards |
| Years Ended December 31,
| 2019 |  | 2018 |  | 2017
|  |  | Weighted- |  |  |  | Weighted- |  |  |  | Weighted-
|  |  | Average |  |  |  | Average |  |  |  | Average
|  |  | Grant Date |  |  |  | Grant Date |  |  |  | Grant Date
Performance Share Unit Awards | Shares |  | Fair Value |  | Shares |  | Fair Value |  | Shares |  | Fair Value
Outstanding at January 1, | 32,382 |  | $ | - |  | 33,454 |  | $ | - |  | 21,223 |  | $ | -
Granted | 16,855 |  |  | 223.45 |  | 13,325 |  |  | 242.39 |  | 11,245 |  |  | 234.03
Increase/(Decrease) on vesting units due to performance | (3,455) |  |  | - |  | (267) |  |  | - |  | 986 |  |  | -
Vested | 10,922 |  |  | 223.45 |  | 12,435 |  |  | 242.39 |  | - |  |  | -
Forfeited | - |  |  | - |  | 1,695 |  |  | - |  | - |  |  | -
Outstanding at December 31, | 34,850 |  |  | - |  | 32,382 |  |  | - |  | 33,454 |  |  | -

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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