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Stock-Based Compensation Plans (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 02, 2019 | Apr. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 01, 2018 | May 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for issuance (in shares) |  |  | 310,086 |  |  |  |
Tax withholding associated with awards issued |  |  | $ 955 | $ 641 | $ 500 |  |
Compensation expense not yet recognized |  |  | $ 873 | $ 1,500 |  |  |
Weighted average amortization period of compensation not yet recognized |  |  | 1 year 9 months 31 days | 1 year 9 months 26 days |  |  |
Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 3,264 | $ 2,885 | 3,058 |  |
Tax withholding associated with awards issued |  |  | 688 | 641 | 500 |  |
Stock-based compensation included in costs and operating expenses |  |  | 3,264 | 3,027 | 3,068 |  |
Income tax benefit recognized for stock-based compensation |  |  | (663) | (755) | (1,180) |  |
Stock-based compensation expense, net of income tax benefit |  |  | 2,601 | 2,272 | 1,888 |  |
Restricted Stock | Non-employee Directors |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  | 597 | 553 | 642 |  |
Restricted Stock | Employee |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 2,667 | $ 2,332 | $ 2,416 |  |
Restricted Stock Plan 2006 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized (in shares) |  |  | 1,000,000 |  |  |  | 500,000
Restricted Stock Plan 2006 | Non-employee Directors |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock awarded (in shares) |  |  | 18,900 | 11,200 | 16,100 |  |
Stock-based compensation expense |  |  | $ 597 | $ 553 | $ 642 |  |
Restricted Stock Plan 2006 | Employee |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock awarded (in shares) | 44,839 |  |  |  |  |  |
Grant date fair value (in dollars per share) | $ 34.84 |  |  |  |  |  |
Vested award is paid in our shares | 100.00% |  |  |  |  | 100.00% |
Restricted Stock Plan 2006 | President, CEO, and COO |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock awarded (in shares) |  | 20,348 |  |  |  |  |
Grant date fair value (in dollars per share) |  | $ 30.66 |  |  |  |  |
Stock-based compensation expense |  | $ 736 |  |  |  |  |
Tax withholding associated with awards issued |  | $ 267 |  |  |  |  |
Restricted Stock Plan 2006 | Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Grant date fair value (in dollars per share) |  |  | $ 31.58 | $ 49.38 | $ 39.85 |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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