Weighted Average Shares

12 Months Ended

Dec. 31, 2022

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


	Year Ended December 31,
	2022	2021	2020
Basic weighted-average common shares outstanding	173,407	176,463	173,489
Effect of dilutive stock awards	1,462	3,453	3,103
Diluted weighted-average common and common-equivalent shares outstanding	174,869	179,916	176,592

Stock options to purchase 4,715,104, 497,504, and 4,371,194 shares of common stock, on a weighted-average basis, were outstanding in 2022, 2021, and 2020, respectively, but were not included in the calculation of dilutive net income per share because they were anti-dilutive. Restricted stock units totaling 26,079, 605, and 3,826 shares of common stock, on a weighted-average basis, were outstanding in 2022, 2021, and 2020, respectively, but were not included in the calculation of dilutive net income per share because they were anti-dilutive. No PRSUs were excluded in the calculation of dilutive net income per share in 2022, 2021, and 2020 as PRSUs were not anti-dilutive on a weighted-average basis.