Earnings Per Share

Basic earnings per share is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding. Diluted earnings per share is computed by dividing net income available to common stockholders by the weighted-average number of common shares plus the effect of dilutive potential common shares outstanding during the period. Net income and earnings per share for 2018 reflect lower effective tax rates due to the enactment of the Tax Act in December 2017, as discussed further below (see "Management’s Discussion and Analysis of Financial Condition and Results of Operations-Results of Operations-Other costs/(income)"). The following table sets forth the computation of basic and diluted earnings per share (shares in thousands):



	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Numerator:
Net income available to common stockholders	$	270	$	141	453		250
Denominator:
Denominator for basic earnings per share—weighted-average common shares	83,456		84,635		83,854		84,546
Effect of dilutive securities:
Employee stock options	370		394		393		403
Restricted stock units	373		379		476		452
Denominator for diluted earnings per share—adjusted weighted-average common shares	84,199		85,408		84,723		85,401
Basic earnings per share	$	3.22	$	1.67	$	5.40	$	2.95
Diluted earnings per share	$	3.20	$	1.65	$	5.34	$	2.92