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EARNINGS PER SHARE | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
EARNINGS PER SHARE | 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.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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