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Earnings per Common Share
 6 Months Ended
Jun. 30, 2020
Earnings Per Share [Abstract]  
Earnings per Common Share Earnings per Common Share
The calculation of basic and diluted earnings per share (EPS) was as follows:
 Three Months Ended June 30,Six Months Ended June 30,
 2020201920202019
(In thousands, except per share data)
Basic earnings per Class A common share
Numerator:
Net income$3,294  $34,692  $50,139  $98,735  
Income attributable to unvested Walmart restricted shares(52) —  (828) —  
Net income allocated to Class A common stockholders$3,242  $34,692  $49,311  $98,735  
Denominator:
Weighted-average Class A shares issued and outstanding52,275  52,588  52,084  52,818  
Basic earnings per Class A common share$0.06  $0.66  $0.95  $1.87  
Diluted earnings per Class A common share
Numerator:
Net income allocated to Class A common stockholders$3,242  $34,692  $49,311  $98,735  
Re-allocated earnings1  —  13  —  
Diluted net income allocated to Class A common stockholders$3,243  $34,692  $49,324  $98,735  
Denominator:
Weighted-average Class A shares issued and outstanding52,275  52,588  52,084  52,818  
Dilutive potential common shares:
Stock options58  131  57  150  
Restricted stock units 567  456  469  586  
Performance-based restricted stock units258  630  299  592  
Employee stock purchase plan6  6  4  8  
Diluted weighted-average Class A shares issued and outstanding53,164  53,811  52,913  54,154  
Diluted earnings per Class A common share$0.06  $0.64  $0.93  $1.82  
The restricted shares issued to Walmart contain non-forfeitable rights to dividends and are considered participating securities for purposes of computing EPS pursuant to the two-class method. The computation above excludes income attributable to the unvested restricted shares from the numerator and excludes the dilutive impact of those underlying shares from the denominator.
For the periods presented, we excluded certain restricted stock units and stock options outstanding (as applicable), which could potentially dilute basic EPS in the future, from the computation of diluted EPS as their effect was anti-dilutive. Additionally, we have excluded any performance-based restricted stock units and performance-based stock options where the performance contingency has not been met as of the end of the period. The following table shows the weighted-average number of shares excluded from the diluted EPS calculation as their effects were anti-dilutive:
 Three Months Ended June 30,Six Months Ended June 30,
 2020201920202019
(In thousands)
Class A common stock
Options to purchase Class A common stock795  —  772  —  
Restricted stock units268  329  295  226  
Performance-based restricted stock units453  431  286  217  
Unvested Walmart restricted shares 840  —  875  —  
Total 2,356  760  2,228  443