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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted Net Earnings per Share | The following table reconciles the number of common shares used in calculating the basic and diluted net earnings per share:
|  | December 31,
|  | 2017 |  | 2016 |  | 2015
Basic average common shares outstanding 1 |  | 16,464,286 |  |  | 17,000,599 |  |  | 18,762,451 |
Incremental shares due to: |  |  |  |  |  |
Restricted stock units |  | 21,522 |  |  | 21,668 |  |  | 33,128 |
Performance shares |  | 45,252 |  |  | 76,525 |  |  | 24,717 |
Stock options |  | 24,866 |  |  | 7,648 |  |  | — |
Diluted average common shares outstanding |  | 16,555,926 |  |  | 17,106,440 |  |  | 18,820,296 |
Basic net earnings per common share |  | $ | 5.91 |  |  | $ | 2.91 |  |  | $ | 2.98 |
Diluted net earnings per common share |  | 5.88 |  |  | 2.90 |  |  | 2.97 |
Anti-dilutive shares excluded from calculation |  | 499,348 |  |  | 220,037 |  |  | 331,168 |

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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/2003/role/presentationRef -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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