Per Share Information

3 Months Ended

Mar. 31, 2017

6.	PER SHARE INFORMATION:

Basic earnings per share attributable to common stock is computed using the weighted average number of common shares outstanding during the period, and diluted earnings per share attributable to common stock is computed using the weighted average number of common shares 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. The amounts used to compute the basic and diluted earnings per share attributable to common stock for the three months ended March 31, 2017 and 2016 are illustrated below (in thousands):


	Three Months Ended March 31,
	2017		2016
Amounts attributable to common stock:
Net income attributable to common stock	$	48,267	$	20,496

Weighted average shares:
Weighted average shares outstanding for basic earnings per share attributable to common stock		155,168		162,803
Effect of dilutive stock options		—		3

Weighted average shares outstanding for diluted earnings per share attributable to common stock		155,168		162,806

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. Outstanding exchangeable shares that were issued pursuant to certain of Quanta’s historical acquisitions (as further discussed in Note 8), which are exchangeable on a one-for-one basis with shares of Quanta common stock, have been included in the calculation of weighted average shares outstanding for basic and diluted earnings per share attributable to common stock for the three months ended March 31, 2017 and 2016 for the portion of the periods that they were outstanding.