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Net Income Per Share
 6 Months Ended
Jun. 28, 2020
Earnings Per Share [Abstract]  
Net Income Per Share NET INCOME PER SHARE
 
We calculate basic net income per share by dividing earnings allocated to common stockholders by the basic weighted-average number of common shares outstanding for the period.

Diluted weighted-average shares is computed using basic weighted-average number of common shares outstanding plus any potentially dilutive securities outstanding during the period using the treasury-stock-type method and the if-converted method, except when their effect is anti-dilutive. Potentially dilutive securities include stock options, restricted stock units, and the outstanding senior convertible debentures.
The following table presents the calculation of basic and diluted net income per share attributable to stockholders:
 Three Months EndedSix Months Ended
(In thousands, except per share amounts)June 28, 2020June 30, 2019June 28, 2020June 30, 2019
Basic net income per share:
Numerator:
Net income attributable to stockholders$19,378  $121,459  $17,947  $31,735  
Denominator:
Basic weighted-average common shares170,003  142,471  169,413  142,095  
Basic net income per share$0.11  $0.85  $0.11  $0.22  
Diluted net income per share1
Numerator:
     Net income attributable to stockholders$19,378  $121,459  $17,947  $31,735  
       Add: Interest expense on 4.00% debenture due 2023, net of tax
—  3,358  —  —  
       Add: Interest expense on 0.875% debenture due 2021, net of tax
535  691  —  —  
Net income available to common stockholders$19,913  $125,508  $17,947  $31,735  
Denominator:
    Basic weighted-average common shares170,003  142,471  169,413  142,095  
    Effect of dilutive securities:
        Restricted stock units1,765  2,241  1,558  967  
        0.875% debentures due 2021
6,350  8,203  —  —  
        4.00% debentures due 2023
—  13,922  —  —  
Dilutive weighted-average common shares:178,118  166,837  170,971  143,062  
Dilutive net income per share$0.11  $0.75  $0.10  $0.22  


The following is a summary of outstanding anti-dilutive potential common stock that was excluded from diluted net loss per share attributable to stockholders in the following periods:
 Three Months EndedSix Months Ended
(In thousands)June 28, 2020June 30, 2019June 28, 2020June 30, 2019
Restricted stock units3,596  765  4,509  2,497  
4.00% debentures due 2023
13,922  —  13,922  13,922  
0.875% debentures due 2021
—  —  8,203  8,203