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Basic and Diluted Earnings per Share | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Basic and Diluted Earnings per Share | (10) Basic and Diluted Earnings per Share Potential shares of common stock are included in the diluted earnings per share calculation when dilutive. Potential shares of common stock, consisting of common stock issuable upon exercise of outstanding stock options, are calculated using the treasury stock method. 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 |
For the years ended December 31, 2018, 2017, and 2016, stock options issued under the 2013 Equity Plan to purchase a weighted average of approximately 896,000, 398,000, and 391,000 shares of class A common stock, respectively, were excluded from the diluted earnings per share calculation because their impact would have been anti-dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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