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Earnings Per Common Share And Share Awards (Tables) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Computation Of Basic And Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings (loss) per share for the three-month periods ended March 31:
|  | Three Months Ended March 31,
(in thousands, except per share amounts) |  | 2021 |  | 2020
Net income (loss) |  | $ | 13,823 |  |  | $ | (7,011) |
Weighted average common shares outstanding – Basic |  | 1,894 |  |  | 1,890 |
Incremental shares outstanding assuming the exercise of dilutive SARs (share-settled) |  | 3 |  |  | — |
Weighted average common shares outstanding – Diluted |  | 1,897 |  |  | 1,890 |
Basic earnings (loss) per common share |  | $ | 7.30 |  |  | $ | (3.71) |
Diluted earnings (loss) per common share |  | $ | 7.29 |  |  | $ | (3.71) |
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, 2020 | 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 |
SARs granted | — |  |  | — |  |  |  |  |
SARs exercised | (3) |  |  | 68.70 |  |  |  |  |
Outstanding as of March 31, 2021 | 33 |  |  | $ | 145.47 |  |  | 4.49 |  | $ | 910 |
Exercisable as of March 31, 2021 | 26 |  |  | $ | 146.55 |  |  | 4.03 |  | $ | 738 |
Unvested as of March 31, 2021 | 7 |  |  | $ | 141.37 |  |  | 6.24 |  | $ | 172 |
Share-Based Valuation Assumptions | The weighted average fair value for the SARs issued during first quarter 2020 was $35.49 and was estimated using the weighted average assumptions shown in the table below.
| 2020
Expected Life in Years | 6.2 | - | 7.0
Volatility | 27.2%
Interest Rate | 0.8%
Yield Rate | 1.0%

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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