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Earnings (Loss) Attributable to Tennant Company Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings (Loss) per Share | The computations of Basic and Diluted Earnings (Loss) per Share were as follows:
| Three Months Ended |  | Nine Months Ended
| September 30 |  | September 30
| 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |
Net Earnings (Loss) Attributable to Tennant Company | $ | 9,676 |  |  | $ | 3,559 |  |  | $ | 25,694 |  |  | $ | (2,989 | )
Denominator: |  |  |  |  |  |  |
Basic - Weighted Average Shares Outstanding | 17,998,917 |  |  | 17,729,857 |  |  | 17,911,880 |  |  | 17,673,656 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation plans | 440,704 |  |  | 441,587 |  |  | 432,933 |  |  | — |
Diluted - Weighted Average Shares Outstanding | 18,439,621 |  |  | 18,171,444 |  |  | 18,344,813 |  |  | 17,673,656 |
Basic Earnings (Loss) per Share | $ | 0.54 |  |  | $ | 0.20 |  |  | $ | 1.43 |  |  | $ | (0.17 | )
Diluted Earnings (Loss) per Share | $ | 0.52 |  |  | $ | 0.20 |  |  | $ | 1.40 |  |  | $ | (0.17 | )

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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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