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Earnings (Loss) Attributable to Tennant Company Per Share (Tables) | 6 Months Ended
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Jun. 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 |  | Six Months Ended
| June 30 |  | June 30
| 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |
Net Earnings (Loss) Attributable to Tennant Company | $ | 12,744 |  |  | $ | (2,591 | ) |  | $ | 16,018 |  |  | $ | (6,548 | )
Denominator: |  |  |  |  |  |  |
Basic - Weighted Average Shares Outstanding | 17,943,450 |  |  | 17,693,102 |  |  | 17,867,641 |  |  | 17,645,090 |
Effect of dilutive securities: |  |  |  |  |  |  |
Share-based compensation plans | 428,088 |  |  | — |  |  | 436,319 |  |  | — |
Diluted - Weighted Average Shares Outstanding | 18,371,538 |  |  | 17,693,102 |  |  | 18,303,960 |  |  | 17,645,090 |
Basic Earnings (Loss) per Share | $ | 0.71 |  |  | $ | (0.15 | ) |  | $ | 0.90 |  |  | $ | (0.37 | )
Diluted Earnings (Loss) per Share | $ | 0.69 |  |  | $ | (0.15 | ) |  | $ | 0.88 |  |  | $ | (0.37 | )

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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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