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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings per Share | The computations of Basic and Diluted Earnings (Loss) Attributable to Tennant Company per Share for the years ended December 31 were as follows:
| 2018 |  | 2017 |  | 2016
Numerator: |  |  |  |  |
Net Earnings (Loss) Attributable to Tennant Company | $ | 33,412 |  |  | $ | (6,195 | ) |  | $ | 46,614 |
Denominator: |  |  |  |  |  |  |  |
Basic - Weighted Average Shares Outstanding | 17,940,438 |  |  | 17,695,390 |  |  | 17,523,267 |
Effect of dilutive securities | 398,131 |  |  | — |  |  | 452,916 |
Diluted - Weighted Average Shares Outstanding | 18,338,569 |  |  | 17,695,390 |  |  | 17,976,183 |
Basic Earnings (Loss) per Share | $ | 1.86 |  |  | $ | (0.35 | ) |  | $ | 2.66 |
Diluted Earnings (Loss) per Share | $ | 1.82 |  |  | $ | (0.35 | ) |  | $ | 2.59 |

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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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