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Earnings Per Common Share and Share Awards (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Computation Of Basic And Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings per share for the years ended December 31:
(in thousands, except per share amounts) | 2020 |  | 2019
Net income | $ | 39,420 |  |  | $ | 31,458 |
Weighted average common shares outstanding – Basic | 1,892 |  |  | 1,888 |
Incremental shares outstanding assuming the exercise of dilutive SARs (share-settled) | 4 |  |  | 8 |
Weighted average common shares outstanding – Diluted | 1,896 |  |  | 1,896 |
Basic earnings per common share | $ | 20.84 |  |  | $ | 16.66 |
Diluted earnings per common share | $ | 20.80 |  |  | $ | 16.59 |
Summary Of Share-Based Award Transactions | A summary of share-based award transactions for all share-based award plans follows:
(in thousands, except weighted average exercise price and average remaining contractual term) | Number Of Shares |  | Weighted Average Exercise Price |  | Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding as of January 1, 2019 | 28 |  |  | $ | 110.27 |  |  | 3.64 |  | $ | 2,019 |
SARs granted | 4 |  |  | 162.81 |  |  |  |  |
SARs exercised | (2) |  |  | 50.50 |  |  |  |  |
Outstanding as of December 31, 2019 | 30 |  |  | $ | 124.13 |  |  | 3.53 |  | $ | 1,352 |
SARs granted | 14 |  |  | 137.40 |  |  |  |  |
SARs exercised | (8) |  |  | 75.75 |  |  |  |  |
Outstanding as of December 31, 2020 | 36 |  |  | $ | 139.16 |  |  | 4.38 |  | $ | 903 |
Exercisable as of December 31, 2020 | 27 |  |  | $ | 139.31 |  |  | 3.69 |  | $ | 772 |
Unvested as of December 31, 2020 | 9 |  |  | $ | 138.70 |  |  | 6.44 |  | $ | 131 |
Summary of Information of Fixed Stock Options | The following table summarizes information about SARs outstanding at December 31, 2020:
(in thousands, except exercise prices and average remaining contractual term) |  | SARs Outstanding at Year-End |  | SARs Exercisable at Year-End
Range of Exercise Prices |  | Number Outstanding |  | Weighted Average Remaining Contractual Life |  | Weighted Average Exercise Price |  | Number Exercisable |  | Weighted Average Exercise Price
$ | 60.00 |  |  | — |  | $ | 99.99 |  |  | 9 |  |  | 1.38 |  | $ | 78.52 |  |  | 9 |  |  | $ | 78.52 |
100.00 |  |  | — |  | 149.99 |  |  | 12 |  |  | 6.43 |  | 134.41 |  |  | 3 |  |  | 122.80 |
150.00 |  |  | — |  | 199.99 |  |  | 15 |  |  | 4.48 |  | 179.50 |  |  | 15 |  |  | 179.50 |
$ | 60.00 |  |  | — |  | $ | 199.99 |  |  | 36 |  |  | 4.38 |  | $ | 139.16 |  |  | 27 |  |  | $ | 139.31 |
Share-Based Valuation Assumptions | The weighted average fair values for the SARs issued during 2020 and 2019 were $36.30 and $51.88, respectively, and were estimated using the weighted average assumptions shown in the table below.
| 2020 |  | 2019
Expected life in years | 6.2 | - | 7.0 |  | 7.0 | - | 7.0
Volatility | 29.4% |  | 30.2%
Interest rate | 0.7% |  | 2.3%
Yield rate | 1.2% |  | 1.0%

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + 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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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