Per Share Information

3 Months Ended

Mar. 31, 2021

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 Ended
	March 31,
	2021		2020
Amounts attributable to common stock:
Net income attributable to common stock	$	89,761	$	38,686

Weighted average shares:
Weighted average shares outstanding for basic earnings per share attributable to common stock	140,121		144,454
Effect of dilutive unvested non-participating stock-based awards	4,326		2,333
Weighted average shares outstanding for diluted earnings per share attributable to common stock	144,447		146,787

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 1.1 million and 2.3 million weighted average participating securities for the three months ended March 31, 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.