NOTE B—EARNINGS PER SHARE

Basic earnings per common share is computed by dividing income available to common stockholders by the weighted average number of common shares outstanding for the period. Diluted earnings per common share is computed similarly to basic earnings per common share except that the weighted average number of common shares outstanding is increased to include the number of additional common shares that would have been outstanding if the potentially dilutive common shares had been issued.

The following table shows the computation of basic and diluted earnings per share for the three and six months ended June 30, 2018 and 2017:



In thousands, except per share amounts	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Numerator:
Net income	$	17,644	$	29,459	$	48,938	$	31,981

Denominator:
Weighted average shares outstanding	77,784		81,087		78,636		81,032
Diluted effect of stock awards	696		858		692		1,071
Weighted average shares outstanding assuming dilution	78,480		81,945		79,328		82,103

Basic earnings per share	$	0.23	$	0.36	$	0.62	$	0.39
Diluted earnings per share	$	0.22	$	0.36	$	0.62	$	0.39

Certain stock options, restricted stock awards and performance share units were excluded from the computation of diluted earnings per share because their effect would have been anti-dilutive. Weighted-average stock awards (in thousands) excluded from the calculation of diluted earnings per common share were as follows:



	Three Months Ended June 30,		Six Months Ended June 30,
	2018	2017	2018	2017
Weighted-average outstanding stock options excluded	426	195	427	195
Weighted-average outstanding restricted stock and performance share units awards excluded	264	426	319	48