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Earnings per Share | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | s 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. A reconciliation of the common shares used in the denominator for computing basic and diluted EPS is as follows :
|  | Year Ended December 31,
(in thousands, except per share amounts) |  | 2018 |  | 2017 |  | 2016
Weighted average common shares outstanding, used in computing basic earnings per share |  | 69,614 |  |  | 69,759 |  |  | 69,683 |
Effect of dilutive stock options and restricted stock units |  | 787 |  |  | 694 |  |  | 949 |
Weighted-average common shares outstanding, used in computing diluted earnings per share |  | 70,401 |  |  | 70,453 |  |  | 70,632 |
Earnings per share of common stock attributable to Columbia Sportswear Company: |  |  |  |  |  |
Basic |  | $ | 3.85 |  |  | $ | 1.51 |  |  | $ | 2.75 |
Diluted |  | 3.81 |  |  | 1.49 |  |  | 2.72 |
Stock options and service-based restricted stock units representing 340,741, 887,595 and 517,654 shares of common stock for the years ended December 31, 2018, 2017 and 2016, respectively, were outstanding but were excluded from 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 31,775, 40,848 and 63,430 shares of common stock for the years ended December 31, 2018, 2017 and 2016, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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