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Per Share Information
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Per Share Information PER SHARE INFORMATION:
The amounts used to compute basic and diluted earnings per share attributable to common stock consisted of the following (in thousands):
Three Months EndedSix Months Ended
June 30,June 30,
2021202020212020
Amounts attributable to common stock:
Net income attributable to common stock$117,033 $73,946 $206,794 $112,632 
Weighted average shares outstanding:
Weighted average shares outstanding for basic earnings per share attributable to common stock140,276 139,856 140,199 142,154 
Effect of dilutive unvested non-participating stock-based awards4,331 3,665 4,324 3,059 
Weighted average shares outstanding for diluted earnings per share attributable to common stock144,607 143,521 144,523 145,213 
Basic and diluted earnings per share attributable to common stock are computed using the weighted average number of shares of common stock outstanding during the applicable period. Unvested stock-based awards that contain non-forfeitable rights to dividends or dividend equivalents (participating securities) have been included in the calculation of basic and diluted earnings per share attributable to common stock for the portion of the periods that the awards were outstanding. Weighted average shares outstanding for basic and diluted earnings per share attributable to common stock included 0.6 million and 1.5 million weighted average participating securities for the three months ended June 30, 2021 and 2020 and 0.8 million and 1.9 million weighted average participating securities for the six months ended June 30, 2021 and 2020.
For purposes of calculating diluted earnings per share attributable to common stock, there were no adjustments required to derive Quanta’s net income attributable to common stock. Diluted earnings per share attributable to common stock is computed using the weighted average number of shares of common stock outstanding during the period adjusted for all
potentially dilutive common stock equivalents, except in cases where the effect of the common stock equivalents would be antidilutive.