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Computation of Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Calculation of Basic and Diluted Earnings Per Share | The calculation of basic and diluted earnings per share for the three and six months ended June 30, 2018 and 2017 was as follows:
|  | Three Months Ended June 30 |  |  | Six Months Ended June 30 |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 6,735 |  |  | $ | 4,156 |  |  | $ | 12,263 |  |  | $ | 5,674 |
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination of shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding |  |  | 5,044 |  |  |  | 5,116 |  |  |  | 5,045 |  |  |  | 5,117 |
Dilutive effect - share-based awards |  |  | 20 |  |  |  | 11 |  |  |  | 19 |  |  |  | 15 |
Diluted weighted-average common shares outstanding |  |  | 5,064 |  |  |  | 5,127 |  |  |  | 5,064 |  |  |  | 5,132 |
Earnings per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.34 |  |  | $ | 0.81 |  |  | $ | 2.43 |  |  | $ | 1.11 |
Diluted |  | $ | 1.33 |  |  | $ | 0.81 |  |  | $ | 2.42 |  |  | $ | 1.11 |

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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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