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Weighted Average Shares
 12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Weighted Average Shares Weighted Average Shares
Weighted-average shares were calculated as follows (in thousands):
 Year Ended December 31,
202320222021
Basic weighted-average common shares outstanding172,249 173,407 176,463 
Effect of dilutive stock awards1,150 1,462 3,453 
Diluted weighted-average common and common-equivalent shares outstanding173,399 174,869 179,916 
Stock options to purchase 6,854,092, 4,715,104, and 497,504 shares of common stock, on a weighted-average basis, were outstanding in 2023, 2022, and 2021, respectively, but were not included in the calculation of dilutive net income per share because they were anti-dilutive. Restricted stock units totaling 365, 26,079, and 605 that will be settled in shares of common stock to the extent they vest, on a weighted-average basis, were outstanding in 2023, 2022, and 2021, 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 2023, 2022, and 2021 as PRSUs were not anti-dilutive on a weighted-average basis.