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Earnings Per Common Share And Share Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Earnings Per Common Share And Share Awards [Line Items] |  |  |  |  |  |  |  |  |
Anti-dilutive shares excluded from computation of diluted earnings per share | 14 |  |  | 20 |  |  | 14 | 20 |
Number of SARs granted where exercise price was less than market price on date of grant |  |  |  |  |  |  | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Net of Forfeitures |  | 5 |  |  | 4 | 7 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  |  |  | $ 59.83 | $ 34.45 |
SARs |  |  |  |  |  |  |  |  |
Earnings Per Common Share And Share Awards [Line Items] |  |  |  |  |  |  |  |  |
SARs expiration period |  |  |  |  |  |  | 7 years |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  | $ 206 | $ 192 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 401 |  |  |  |  |  | $ 401 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Net of Forfeitures |  |  | 0 |  |  |  | 5 |  | 14
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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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