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EARNINGS PER SHARE (Tables)
 3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
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)
2017
 
2016
Net income attributable to WESCO International, Inc.
$
37,729

 
$
36,053

Weighted-average common shares outstanding used in computing basic earnings per share
48,707

 
42,210

Common shares issuable upon exercise of dilutive equity awards
694

 
414

Common shares issuable from contingently convertible debentures (see below for basis of calculation)
—

 
4,189

Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share

49,401

 
46,813

Earnings per share attributable to WESCO International, Inc.
 
 
 
Basic
$
0.77

 
$
0.85

Diluted
$
0.76

 
$
0.77