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Earnings Per Common Share And Share Awards (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Earnings Per Common Share And Share Awards [Line Items] |  |  |  |  |
Anti-dilutive shares excluded from computation of diluted earnings per share | 14,000 | 9,000 | 14,000 | 4,000 |
Number of SARs granted where exercise price was less than market price on date of grant |  |  | 0 |  |
Share-based Payment Arrangement, Expense |  |  | $ 205 | $ 239 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 117 |  | $ 117 |  |
SARs |  |  |  |  |
Earnings Per Common Share And Share Awards [Line Items] |  |  |  |  |
SARs expiration period |  |  | 7 years |  |
SARs vesting period |  |  | 1 year |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |  |  | 4,000 | 4,000 | 4,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 51.88 | $ 78.61 |
Maximum | SARs |  |  |  |  |
Earnings Per Common Share And Share Awards [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award |  |  | 250,000 |  |

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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=116856206&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=116856206&loc=d3e5070-113901 + Details
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