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 stock that shared in our earnings.

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



	Years Ended December 31,
	2018		2017		2016
	(In thousands, except per share amounts)
Amounts attributable to common stockholders:
Net income — basic	$	447,208	$	546,663	$	177,038
After tax interest on convertible debt	—		52		43
Net income — diluted	$	447,208	$	546,715	$	177,081
Weighted average shares:
Weighted average shares — basic	182,447		187,630		193,086
Stock options	4,339		4,396		2,823
Restricted share units	186		99		12
Convertible debt	—		121		121
Weighted average shares — diluted	186,972		192,246		196,042
Amounts attributable to common stockholders:
Net income per share:
Basic	$	2.45	$	2.91	$	0.92
Diluted	$	2.39	$	2.84	$	0.90

The computation of diluted earnings per share excludes outstanding stock options in certain periods in which the inclusion of such options would be antidilutive to the periods presented. Total antidilutive options not currently included in the computation of dilutive EPS