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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Weighted Average Shares and Share Equivalents Used to Calculate Basic and Diluted Earnings Per Share | The following weighted average shares and share equivalents were used to calculate basic and diluted earnings per share for the years ended December 31, 2017, 2016 and 2015:
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Weighted average number of shares outstanding used to calculate basic EPS |  | 3,733 |  |  | 3,847 |  |  | 4,022 |
Dilutive securities: |  |  |  |  |  |  |
Stock options and restricted share units |  | 507 |  |  | 257 |  |  | 233 |
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS |  | 4,240 |  |  | 4,104 |  |  | 4,255 |
Summary of Antidilutive Securities Excluded from Computation of Earnings Per Share | The following stock options issued under equity incentive plans were outstanding during the years ended December 31, 2017, 2016 and 2015, but were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive.
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Anti-dilutive securities |  | 15 |  |  | 87 |  |  | 50 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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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