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				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
	(In thousands, except per share amounts)
Amounts attributable to common stockholders:
Net income:
Net income — basic	$	68,481	$	15,620	$	243,183	$	63,065
After tax interest on convertible debt	13		10		25		22
Net income — diluted	$	68,494	$	15,630	$	243,208	$	63,087
Weighted average shares (denominator):
Weighted average shares — basic	187,597		193,806		187,927		194,366
Stock options	4,333		2,788		4,389		2,975
Restricted stock units	87		3		74		1
Convertible debt	121		121		121		121
Weighted average shares — diluted	192,138		196,718		192,511		197,463
Net income per share:
Basic	$	0.37	$	0.08	$	1.29	$	0.32
Diluted	$	0.36	$	0.08	$	1.26	$	0.32

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 not included in the computation of dilutive EPS are as follows (in shares):



	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2017	2016	2017	2016
	(In thousands)
Antidilutive options	1,523	1,799	1,212	2,338
Antidilutive restricted stock units	—	—	—	24
Total common stock equivalents excluded from computation	1,523	1,799	1,212	2,362