11. Earnings Per Share

Basic earnings per common share (EPS) excludes dilution and is computed by dividing Net income attributable to common stockholders by the weighted average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other obligations to issue common stock were exercised or converted into common stock or resulted in the issuance of common shares that then shared in our earnings.

A reconciliation of the numerators and denominators of the basic and diluted EPS computations is presented below:



	Three Months Ended
	March 31,
	2019		2018
	(In thousands, except per share amounts)
Amounts attributable to common stockholders:
Net income:
Net income — basic	$	79,323	$	81,988
After tax interest on convertible debt	—		15
Net income — diluted	$	79,323	$	82,003
Weighted average shares (denominator):
Weighted average shares — basic	181,696		185,130
Stock options	3,562		4,522
Restricted stock units	59		150
Convertible debt	—		121
Weighted average shares — diluted	185,317		189,923
Net income per share:
Basic	$	0.44	$	0.44
Diluted	$	0.43	$	0.43

The computation of diluted EPS excludes outstanding stock options and restricted share units in certain periods in which the inclusion of such equity awards would be anti-dilutive in the periods presented. Total equity awards not included in the computation of dilutive EPS are as follows (in shares):



	Three Months Ended
	March 31,
	2019	2018
	(In thousands)
Antidilutive options	—	577
Antidilutive restricted stock units	37	—