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Basic and Diluted Earnings per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
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, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  |  |  |  |  | (as adjusted) |  |  | (as adjusted) |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 22,501 |  |  | $ | 18,195 |  |  | $ | 92,239 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares of class A common stock |  |  | 9,340 |  |  |  | 9,409 |  |  |  | 9,390 |
Weighted average common shares of class B common stock |  |  | 2,035 |  |  |  | 2,035 |  |  |  | 2,035 |
Total weighted average common stock shares outstanding |  |  | 11,375 |  |  |  | 11,444 |  |  |  | 11,425 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Employee stock options |  |  | 37 |  |  |  | 103 |  |  |  | 91 |
Adjusted weighted average shares |  |  | 11,412 |  |  |  | 11,547 |  |  |  | 11,516 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | 1.98 |  |  | $ | 1.59 |  |  | $ | 8.07 |
Diluted earnings per share |  | $ | 1.97 |  |  | $ | 1.58 |  |  | $ | 8.01 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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