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Earnings per Share
 6 Months Ended
Jul. 03, 2021
Earnings Per Share [Abstract]  
Earnings per Share Earnings per Share
Basic and diluted earnings per share (EPS) were calculated as follows:
 Three Months EndedSix Months Ended
 July 3,
2021		June 27,
2020		July 3,
2021		June 27,
2020
(In thousands, except per share amounts)
Net Income Attributable to Kadant$22,864 $11,607 $39,425 $24,138 
Basic Weighted Average Shares11,579 11,482 11,566 11,457 
Effect of Stock Options, Restricted Stock Units and Employee Stock Purchase Plan Shares
71 70 65 73 
Diluted Weighted Average Shares11,650 11,552 11,631 11,530 
Basic Earnings per Share$1.97 $1.01 $3.41 $2.11 
Diluted Earnings per Share$1.96 $1.00 $3.39 $2.09 

The effect of outstanding and unvested restricted stock units (RSUs) of the Company's common stock totaling 9,000 shares in the second quarter of 2021, 36,000 shares in the second quarter of 2020, 27,000 in the first six months of 2021, and 39,000 in the first six months of 2020 was not included in the computation of diluted EPS for the respective periods as the effect would have been antidilutive or, for unvested performance-based RSUs, the performance conditions had not been met as of the end of the reporting periods.