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Earnings per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings Per Share | EARNINGS PER SHARE Earnings per share ("EPS") is presented on both a basic and diluted basis. Basic EPS is based on the weighted average number of common shares outstanding. Diluted EPS reflects the potential dilution that could occur if outstanding securities or other contracts to issue common stock were exercised or converted into common stock. For the calculation of diluted EPS, the basic weighted average number of shares is increased by the dilutive effect of stock options and restricted stock units determined using the treasury stock method. A reconciliation of the common shares used in the denominator for computing basic and diluted EPS is as follows (in thousands, except per share amounts):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Weighted average common shares outstanding, used in computing basic earnings per share |  | 69,759 |  |  | 69,683 |  |  | 70,162 |
Effect of dilutive stock options and restricted stock units |  | 694 |  |  | 949 |  |  | 902 |
Weighted-average common shares outstanding, used in computing diluted earnings per share |  | 70,453 |  |  | 70,632 |  |  | 71,064 |
Earnings per share of common stock attributable to Columbia Sportswear Company: |  |  |  |  |  |
Basic |  | $ | 1.51 |  |  | $ | 2.75 |  |  | $ | 2.48 |
Diluted |  | 1.49 |  |  | 2.72 |  |  | 2.45 |
Stock options and service-based restricted stock units representing 887,595, 517,654 and 154,170 shares of common stock for the years ended December 31, 2017, 2016 and 2015, respectively, were outstanding but were excluded in the computation of diluted EPS because their effect would be anti-dilutive as a result of applying the treasury stock method. In addition, performance-based restricted stock units representing 40,848, 63,430 and 122,858 shares for the years ended December 31, 2017, 2016 and 2015, respectively, were outstanding but were excluded from the computation of diluted EPS because these shares were subject to performance conditions that had not been met.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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