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Earnings Per Share
 6 Months Ended
Jun. 30, 2022
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
Basic earnings per share is computed in accordance with ASC 260, Earnings Per Share, based on weighted average outstanding common shares. Diluted earnings per share is computed based on basic weighted average outstanding common shares adjusted for the dilutive effect of stock options, RSUs, and certain contingently issuable shares for which performance targets have been achieved.

The following table reconciles the weighted average share amounts used to compute both basic and diluted earnings per share (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Weighted average shares outstanding:
Basic weighted average shares outstanding114,669 117,718 114,976 117,605 
Add: Dilutive effect of stock options and RSUs536 1,292 673 1,353 
Diluted weighted average shares outstanding115,205 119,010 115,649 118,958 

The diluted earnings per share computation excludes 2.2 million and 1.3 million options to purchase shares, RSUs, and contingently issuable shares during the three months ended June 30, 2022 and 2021, respectively, as their effect would be anti-dilutive. The diluted earnings per share computation excludes 2.0 million and 1.4 million options to purchase shares, RSUs, and contingently issuable shares during the six months ended June 30, 2022 and 2021, respectively, as their effect would be anti-dilutive.

Common stock outstanding as of June 30, 2022, and December 31, 2021, was 114,295,153 and 115,730,046, respectively.