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7. Earnings Per Share
3 Months Ended
Mar. 31, 2022
Earnings Per Share [Abstract]  
Earnings Per Share .    EARNINGS (LOSS) PER SHARE
Basic earnings (loss) per share is computed by dividing net income (loss) attributable to Bio-Rad by the weighted average number of common shares outstanding for that period.  Diluted earnings per share takes into account the effect of dilutive instruments, such as stock options and restricted stock, and uses the average share price for the period in determining the number of potential common shares that are to be added to the weighted average number of shares outstanding.  Potential common shares are excluded from the diluted earnings (loss) per share calculation if the effect of including such securities would be anti-dilutive.

The weighted average number of common shares outstanding used to calculate basic and diluted earnings (loss) per share, and the anti-dilutive shares that are excluded from the diluted earnings (loss) per share calculation are as follows (in thousands):
Three Months Ended
March 31,
 20222021
Basic weighted average shares outstanding29,933 29,823 
Effect of potentially dilutive stock options and restricted stock awards
— 363 
Diluted weighted average common shares outstanding29,933 30,186 
Anti-dilutive shares550 23