Weighted-Average Shares

3 Months Ended

Mar. 31, 2019

Weighted-average shares were calculated as follows (in thousands):



	Three-months Ended
	March 31, 2019	April 1, 2018
Basic weighted-average common shares outstanding	171,098	173,280
Effect of dilutive stock options	4,509	6,361
Weighted-average common and common-equivalent shares outstanding	175,607	179,641

Stock options to purchase 4,832,000 and 1,339,000 shares of common stock, on a weighted-average basis, were outstanding during the three-month periods ended March 31, 2019 and April 1, 2018, respectively, but were not included in the calculation of dilutive net income per share because they were anti-dilutive.