(15) Earnings Per Share

Basic earnings per 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 share reflects the potential dilution that would occur if securities or other contracts to issue common stock were exercised or converted into common stock; however, potential common equivalent shares are excluded if their effect is anti-dilutive.

The following table sets forth the reconciliation of basic and diluted net income per share for the three and nine months ended September 30, 2018 and 2017 (in thousands, except per share data):



	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Numerator
Net income attributable to CAI common stockholders	$	20,006	$	17,587	$	56,272	$	35,497
Denominator
Weighted-average shares used in per share computation - basic		19,214		19,180		19,741		19,108
Effect of dilutive securities:
Stock options and restricted stock		278		453		256		314
Weighted-average shares used in per share computation - diluted		19,492		19,633		19,997		19,422

Net income per share attributable to CAI common stockholders:
Basic	$	1.04	$	0.92	$	2.85	$	1.86
Diluted	$	1.03	$	0.90	$	2.81	$	1.83

The calculation of diluted earnings per share for the three months ended September 30, 2018 and 2017, excluded from the denominator 86,055 and 41,989 shares, respectively, of common stock options because their effect would have been anti-dilutive. The calculation of diluted earnings per share for the nine months ended September 30, 2018 and 2017, excluded from the denominator 158,495 and 822,226 shares, respectively, of common stock options because their effect would have been anti-dilutive.