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Basic and Diluted Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data) for the periods indicated:
|  | Years Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | (7,524 | ) |  | $ | 34,355 |  |  | $ | 22,501 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares of class A common stock |  |  | 7,658 |  |  |  | 8,221 |  |  |  | 9,340 |
Weighted average common shares of class B common stock |  |  | 2,026 |  |  |  | 2,035 |  |  |  | 2,035 |
Total weighted average common stock shares outstanding |  |  | 9,684 |  |  |  | 10,256 |  |  |  | 11,375 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Employee stock options |  |  | 0 |  |  |  | 72 |  |  |  | 37 |
Adjusted weighted average shares |  |  | 9,684 |  |  |  | 10,328 |  |  |  | 11,412 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | (0.78 | ) |  | $ | 3.35 |  |  | $ | 1.98 |
Diluted earnings per share |  | $ | (0.78 | ) |  | $ | 3.33 |  |  | $ | 1.97 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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