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Earnings Per Common Share And Share Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Earnings Per Common Share And Share Awards [Line Items] |  |  |  |  |  |  |
Anti-dilutive shares excluded from computation of diluted earnings per share | 24 | 26 |  |  | 24 | 13 |
Number of SARs granted where exercise price was less than market price on date of grant |  |  |  |  | 0 | 0 |
SARs |  |  |  |  |  |  |
Earnings Per Common Share And Share Awards [Line Items] |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, grants in period, net of forfeitures |  | 5 | 5 | 5 | 5 |  | 10
Share-based compensation arrangement by share-based payment award, grants in period, weighted average grant date fair value |  |  |  |  | $ 55.52 | $ 62.60 |
Share-based payment arrangement, expense |  |  |  |  | $ 337 | $ 259 |
Share-based payment arrangement, nonvested award, cost not yet recognized, amount | $ 494 |  |  |  | $ 494 |  |
Maximum | SARs |  |  |  |  |  |  |
Earnings Per Common Share And Share Awards [Line Items] |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, shares purchased for award |  |  |  |  | 250 |  |
SARs expiration period |  |  |  |  | 7 years |  |
SARs vesting period |  |  |  |  | 5 years |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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