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Per Share Information
 12 Months Ended
Dec. 31, 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):
 Year Ended December 31,
 202120202019
Amounts attributable to common stock:   
Net income attributable to common stock$485,956 $445,596 $402,044 
Weighted average shares:   
Weighted average shares outstanding for basic earnings per share attributable to common stock140,824 141,380 145,710 
Effect of dilutive unvested non-participating stock-based awards4,549 3,867 1,824 
Weighted average shares outstanding for diluted earnings per share attributable to common stock145,373 145,247 147,534 
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. Additionally, 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, 1.6 million and 2.8 million weighted average participating securities for the years ended December 31, 2021, 2020 and 2019.
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.