Basic net income per common share is computed by dividing net income by the weighted average number of common shares outstanding during the period. With regard to common stock subject to vesting requirements and restricted stock units issued to the Company’s employees and non-employee members of its Board of Directors, the calculation includes only the vested portion of such stock and units.

Diluted net income per common share is computed by dividing net income by the weighted average number of common shares outstanding, increased by the assumed conversion of other potentially dilutive securities during the period.

The following table reconciles basic and dilutive weighted average common shares:

	Quarter Ended				Six Months Ended
	June 28,		June 29,		June 28,		June 29,
	2019		2018		2019		2018
Basic weighted average common shares outstanding		29,822,917		29,429,925		29,752,903		29,259,641

Effect of dilutive securities:
Unvested restricted stock units and common stock subject to vesting requirements issued to employees and non-employees		222,438		469,702		230,742		420,020
Common stock issuable upon the exercise of stock options and SARs		2,328,797		2,335,458		2,350,656		2,345,288
Dilutive weighted average common shares outstanding		32,374,152		32,235,085		32,334,301		32,024,949

Approximately 9 thousand shares and 13 thousand shares of common stock equivalents were excluded from the computations of diluted net income per common share for the quarter and six months ended June 28, 2019, respectively, as compared to 843 shares and 864 shares for the quarter and six months ended June 29, 2018, respectively, as their inclusion would have had an anti-dilutive effect on diluted net income per common share.