Earnings per Share

12 Months Ended

Dec. 31, 2019

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)	2019		2018		2017
Weighted average common shares outstanding, used in computing basic earnings per share	67,837		69,614		69,759
Effect of dilutive stock options and restricted stock units	656		787		694
Weighted-average common shares outstanding, used in computing diluted earnings per share	68,493		70,401		70,453
Earnings per share of common stock attributable to Columbia Sportswear Company:
Basic	$	4.87	$	3.85	$	1.51
Diluted	$	4.83	$	3.81	$	1.49

Stock options and service-based restricted stock units, and performance-based restricted stock representing 405,928, 372,516 and 928,443 shares of common stock for the years ended December 31, 2019, 2018 and 2017, 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 or because performance conditions had not been met.