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Earnings Per Common Share and Share Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Earnings Per Common Share And Share Awards [Line Items] |  |
Anti-dilutive shares excluded from computation of diluted earnings per share | 18 | 14
Number of stock options or SARs granted where exercise price was less than market price on date of grant | 0 | 0
Options and SARs vested | 6 |
Fair value of options and SARs vested | $ 229 |
Weighted-average fair values for SARs issued (dollars per share) | $ 36.30 | $ 51.88
Compensation expense relating to SARs or options vesting | $ 229 | $ 264
Total unrecognized compensation cost related to unvested share-based compensation arrangements granted under stock award plans | $ 338 |
Maximum |  |
Earnings Per Common Share And Share Awards [Line Items] |  |
Maximum shares of Company stock to be granted to key employees or directors | 250 |
SARs |  |
Earnings Per Common Share And Share Awards [Line Items] |  |
Intrinsic values of options exercised | $ 583 | $ 364
Stock Appreciation Rights (SARs) | Maximum |  |
Earnings Per Common Share And Share Awards [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 7 years |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 5 years |

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- Definition Number of stock options or SARs granted where exercise price was less than market price on date of grant. + References No definition available. + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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