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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member] | Deferred Compensation [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Shares Held In Trust For Deferred Compensation Plan |  | 97,053 |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 1.18 |  |  |  |  |  |  |  |  |
Beginning Balances (shares) at Dec. 31, 2018 | [1],[2] |  |  | 16,378,545 |  |  |  |  |  |  |
Beginning Balances at Dec. 31, 2018 |  | $ 518,439 |  | $ 7,971 | [1] | $ 255,651 |  | $ 261,530 | $ (6,713) | $ 3,854 | $ (3,854)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net Income |  | 42,589 |  |  |  |  |  | 42,589 |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  | 0 |  |  |  |  |  | 115 | (115) |  |
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect |  |  |  |  |  |  |  |  | (115) |  |
Other comprehensive income (loss) |  | 1,425 |  |  |  |  |  |  | 1,425 |  |
Other Comprehensive Income (Loss), Net of Tax |  | 1,425 |  |  |  |  |  |  |  |  |
Dividend declared |  | (19,540) |  |  |  |  |  | (19,540) |  |  |
Retirement savings plan and dividend reinvestment plan (shares) |  |  |  | 0 |  |  |  |  |  |  |
Dividend reinvestment plan |  | (3) |  | $ 0 |  | (3) |  |  |  |  |
Share-based compensation (shares) |  |  |  | 25,231 |  |  |  |  |  |  |
Share-based compensation and tax benefit |  | 1,801 | [3],[4] | $ 13 |  | 1,788 | [3],[4] |  |  |  |
Treasury stock activities |  | 0 |  |  |  |  |  |  |  | 651 | (651)
Ending Balances (shares) at Sep. 30, 2019 | [1],[2] |  |  | 16,403,776 |  |  |  |  |  |  |
Ending Balances at Sep. 30, 2019 |  | $ 544,711 | [1] | $ 7,984 | [1] | 257,436 |  | 284,694 | (5,403) | 4,505 | (4,505)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  | 7,635 |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.4050 |  |  |  |  |  |  |  |  |
Beginning Balances (shares) at Jun. 30, 2019 | [1],[2] |  |  | 16,403,776 |  |  |  |  |  |  |
Beginning Balances at Jun. 30, 2019 |  | $ 544,384 | [1] | $ 7,984 | [1] | 256,385 |  | 285,762 | (5,747) | 4,694 | (4,694)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net Income |  | 5,621 |  |  |  |  |  | 5,621 |  |  |
Other comprehensive income (loss) |  | 344 |  |  |  |  |  |  | 344 |  |
Other Comprehensive Income (Loss), Net of Tax |  | 344 |  |  |  |  |  |  |  |  |
Dividend declared |  | (6,689) |  |  |  |  |  | (6,689) |  |  |
Dividend reinvestment plan |  | (1) |  |  |  | (1) |  |  |  |  |
Share-based compensation (shares) | [3],[4] |  |  | 0 |  |  |  |  |  |  |
Share-based compensation and tax benefit |  | 1,052 | [3],[4] | $ 0 | [3],[4] | 1,052 |  |  |  |  |
Treasury stock activities |  |  |  |  |  |  |  |  |  | (189) | 189
Ending Balances (shares) at Sep. 30, 2019 | [1],[2] |  |  | 16,403,776 |  |  |  |  |  |  |
Ending Balances at Sep. 30, 2019 |  | $ 544,711 | [1] | $ 7,984 | [1] | 257,436 |  | 284,694 | (5,403) | 4,505 | (4,505)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Shares Held In Trust For Deferred Compensation Plan |  | 94,923 |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  | 2,000,000 |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  | $ 0.01 |  |  |  |  |  |  |  |  |
Shares Held In Trust For Deferred Compensation Plan |  | 95,329 |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 1.285 |  |  |  |  |  |  |  |  |
Beginning Balances (shares) at Dec. 31, 2019 | [1] |  |  | 16,403,776 |  |  |  |  |  |  |
Beginning Balances at Dec. 31, 2019 |  | $ 561,577 | [1] | $ 7,984 | [1] | 259,253 |  | 300,607 | (6,267) | 4,543 | (4,543)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net Income |  | 49,146 |  |  |  |  |  | 49,146 |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  |  |  |  | (30) |  |  |
Other comprehensive income (loss) |  | 2,638 |  |  |  |  |  |  | 2,638 |  |
Other Comprehensive Income (Loss), Net of Tax |  | 2,638 |  |  |  |  |  |  |  |  |
Dividend declared |  | (21,366) |  |  |  |  |  | (21,366) |  |  |
Retirement savings plan and dividend reinvestment plan (shares) |  |  |  | 258,260 |  |  |  |  |  |  |
Dividend reinvestment plan |  | 21,819 |  | $ 126 |  | 21,693 |  |  |  |  |
Share-based compensation (shares) |  |  |  | 34,456 |  |  |  |  |  |  |
Share-based compensation and tax benefit | [3],[4] | 2,906 |  | $ 16 |  | 2,890 |  |  |  |  |
Treasury stock activities |  | 0 |  |  |  |  |  |  |  | 1,091 | (1,091)
Ending Balances (shares) at Sep. 30, 2020 | [1] |  |  | 16,696,492 |  |  |  |  |  |  |
Ending Balances at Sep. 30, 2020 |  | $ 616,690 | [1] | $ 8,126 | [1] | 283,836 |  | 328,357 | (3,629) | 5,634 | (5,634)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  | 10,319 |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  | $ 0.4400 |  |  |  |  |  |  |  |  |
Beginning Balances (shares) at Jun. 30, 2020 | [1] |  |  | 16,463,808 |  |  |  |  |  |  |
Beginning Balances at Jun. 30, 2020 |  | $ 593,277 | [1] | $ 8,013 | [1] | 263,272 |  | 326,454 | (4,462) | 5,659 | (5,659)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net Income |  | 9,261 |  |  |  |  |  | 9,261 |  |  |
Other comprehensive income (loss) |  | 833 |  |  |  |  |  |  | 833 |  |
Other Comprehensive Income (Loss), Net of Tax |  | 833 |  |  |  |  |  |  |  |  |
Dividend declared |  | (7,358) |  |  |  |  |  | (7,358) |  |  |
Retirement savings plan and dividend reinvestment plan (shares) |  |  |  | 232,684 |  |  |  |  |  |  |
Dividend reinvestment plan |  | 19,533 |  | $ 113 |  | 19,420 |  |  |  |  |
Share-based compensation (shares) |  |  |  |  |  |  |  |  |  |  |
Share-based compensation and tax benefit |  | 1,144 | [3],[4] |  |  | 1,144 | [3],[4] |  |  |  |
Treasury stock activities |  | 0 |  |  |  |  |  |  |  | (25) | 25
Ending Balances (shares) at Sep. 30, 2020 | [1] |  |  | 16,696,492 |  |  |  |  |  |  |
Ending Balances at Sep. 30, 2020 |  | $ 616,690 | [1] | $ 8,126 | [1] | $ 283,836 |  | $ 328,357 | $ (3,629) | $ 5,634 | $ (5,634)
Preferred Stock, Shares Authorized |  | 2,000,000 |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  | $ 0.01 |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Shares Held In Trust For Deferred Compensation Plan |  | 104,119 |  |  |  |  |  |  |  |  |
[1] | 2,000,000 shares of preferred stock at $0.01 par value have been authorized. No shares have been issued or are outstanding; accordingly, no information has been included in the statements of stockholders’ equity.
[2] | Includes 104,119 shares at September 30, 2020, 95,329 shares at December 31, 2019, 94,923 shares at September 30, 2019 and 97,053 shares at December 31, 2018, respectively, held in a Rabbi Trust related to our Non-Qualified Deferred Compensation Plan.
[3] | Includes amounts for shares issued for directors’ compensation.
[4] | The shares issued under the SICP are net of shares withheld for employee taxes. For the nine months ended September 30, 2020 and 2019, we withheld 10,319 and 7,635 shares, respectively, for employee taxes.(5)Includes the Retirement Savings Plan, DRIP and ATM equity issuances.

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant