10. 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				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
	(In thousands, except per share amounts)
Amounts attributable to common stockholders:
Net income:
Net income — basic	$	56,164	$	47,727	$	299,347	$	110,792
After tax interest on convertible debt	13		13		38		35
Net income — diluted	$	56,177	$	47,740	$	299,385	$	110,827
Weighted average shares (denominator):
Weighted average shares — basic	187,435		193,274		187,761		193,999
Stock options	4,575		3,154		4,448		3,049
Restricted stock units	112		18		87		6
Convertible debt	121		121		121		121
Weighted average shares — diluted	192,243		196,567		192,417		197,175
Net income per share:
Basic	$	0.30	$	0.25	$	1.59	$	0.57
Diluted	$	0.29	$	0.24	$	1.56	$	0.56

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



	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2017	2016	2017	2016
	(In thousands)
Antidilutive options	—	551	878	936
Antidilutive restricted stock units	—	—	—	2
Total common stock equivalents excluded from computation	—	551	878	938