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Earnings (Loss) Attributable to Tennant Company Per Share (Tables) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings (Loss) per Share | The computations of Basic and Diluted Earnings (Loss) Attributable to Tennant Company per Share were as follows:
| Three Months Ended |  | Nine Months Ended
| September 30 |  | September 30
| 2017 |  | 2016 |  | 2017 |  | 2016
Numerator: |  |  |  |  |  |  |
Net Earnings (Loss) Attributable to Tennant Company | $ | 3,559 |  |  | $ | 11,477 |  |  | $ | (2,989 | ) |  | $ | 31,244 |
Denominator: |  |  |  |  |  |  |
Basic - Weighted Average Shares Outstanding | 17,729,857 |  |  | 17,498,808 |  |  | 17,673,656 |  |  | 17,516,941 |
Effect of Dilutive Securities: |  |  |  |  |  |  |
Share-Based Compensation Plans | 441,587 |  |  | 474,398 |  |  | — |  |  | 438,558 |
Diluted - Weighted Average Shares Outstanding | 18,171,444 |  |  | 17,973,206 |  |  | 17,673,656 |  |  | 17,955,499 |
Basic Earnings (Loss) per Share | $ | 0.20 |  |  | $ | 0.66 |  |  | $ | (0.17 | ) |  | $ | 1.78 |
Diluted Earnings (Loss) per Share | $ | 0.20 |  |  | $ | 0.64 |  |  | $ | (0.17 | ) |  | $ | 1.74 |

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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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