7. EARNINGS PER SHARE

Basic earnings per share is computed by dividing net income attributable to WESCO International by the weighted-average number of common shares outstanding during the periods. Diluted earnings per share is computed by dividing net income attributable to WESCO International by the weighted-average common shares and common share equivalents outstanding during the periods. The dilutive effect of common share equivalents is considered in the diluted earnings per share computation using the treasury stock method, which includes consideration of equity awards.

The following table sets forth the details of basic and diluted earnings per share:



	Three Months Ended
	March 31,
(In thousands, except per share data)	2018		2017
Net income attributable to WESCO International, Inc.	$	44,421	$	37,729
Weighted-average common shares outstanding used in computing basic earnings per share	47,038		48,707
Common shares issuable upon exercise of dilutive equity awards	570		694
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share	47,608		49,401
Earnings per share attributable to WESCO International, Inc.
Basic	$	0.94	$	0.77
Diluted	$	0.93	$	0.76

For the three months ended March 31, 2018 and 2017, the computation of diluted earnings per share attributable to WESCO International, Inc. excluded stock-based awards of approximately 1.5 million and 1.3 million, respectively. These amounts were excluded because their effect would have been antidilutive.