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Weighted Average Shares
12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Weighted Average Shares Weighted Average Shares
Weighted-average shares were calculated as follows (in thousands):
 
Year Ended December 31,
 
2019
 
2018
 
2017
Basic weighted-average common shares outstanding
171,194

 
172,333

 
173,287

Effect of dilutive stock awards
4,075

 
5,073

 
6,264

Diluted weighted-average common and common-equivalent shares outstanding
175,269

 
177,406

 
179,551


Stock options to purchase 5,735,608, 2,650,164, and 3,363,141 shares of common stock, on a weighted-average basis, were outstanding in 2019, 2018, and 2017, respectively, but were not included in the calculation of dilutive net income per share because they were anti-dilutive. Restricted stock units totaling 13,092 shares of common stock, on
a weighted-average basis, were outstanding in 2019, but were not included in the calculation of dilutive net income per share because they were anti-dilutive. There were no restricted stock units outstanding that were anti-dilutive in 2018 or 2017.