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SELECTED QUARTERLY FINANCIAL DATA | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
SELECTED QUARTERLY FINANCIAL DATA | 16. SELECTED QUARTERLY FINANCIAL DATA (unaudited) The following table sets forth selected quarterly financial data for the years ended December 31, 2017 and 2016:
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2017 |  |  |  |  |  |  |
Net Sales | $ | 1,772,591 |  |  | $ | 1,909,624 |  |  | $ | 2,000,159 |  |  | $ | 1,996,647 |
Cost of goods sold (excluding depreciation and amortization) | 1,422,573 |  |  | 1,543,510 |  |  | 1,614,814 |  |  | 1,613,469 |
Income from operations | 67,089 |  |  | 83,105 |  |  | 89,250 |  |  | 81,446 |
Income before income taxes | 50,368 |  |  | 66,289 |  |  | 71,939 |  |  | 63,844 |
Net income (1) | 37,800 |  |  | 49,535 |  |  | 53,576 |  |  | 22,222 |
Net income attributable to WESCO International (1) | 37,729 |  |  | 49,510 |  |  | 53,675 |  |  | 22,546 |
Basic earnings per share attributable to WESCO International (1) (2) | 0.77 |  |  | 1.03 |  |  | 1.13 |  |  | 0.48 |
Diluted earnings per share attributable to WESCO International (1) (3) | 0.76 |  |  | 1.02 |  |  | 1.12 |  |  | 0.47 |
2016 |  |  |  |  |  |  |
Net Sales | $ | 1,775,961 |  |  | $ | 1,911,582 |  |  | $ | 1,855,212 |  |  | $ | 1,793,262 |
Cost of goods sold (excluding depreciation and amortization) | 1,420,793 |  |  | 1,532,113 |  |  | 1,490,173 |  |  | 1,444,735 |
Income from operations | 69,508 |  |  | 87,987 |  |  | 92,555 |  |  | 82,009 |
Income (loss) before income taxes | 50,679 |  |  | 68,535 |  |  | (52,170 | ) |  | 64,507 |
Net income (loss) | 34,534 |  |  | 49,852 |  |  | (31,021 | ) |  | 47,755 |
Net income (loss) attributable to WESCO International | 36,053 |  |  | 49,798 |  |  | (31,611 | ) |  | 47,348 |
Basic earnings (loss) per share attributable to WESCO International (2) (4) | 0.85 |  |  | 1.18 |  |  | (0.73 | ) |  | 0.97 |
Diluted earnings (loss) per share attributable to WESCO International (3) (4) | 0.77 |  |  | 1.02 |  |  | (0.73 | ) |  | 0.96 |
(1) | As described in Note 9, net income and net income attributable to WESCO International include provisional discrete income tax expense of $26.4 million resulting from the application of the TCJA, which affected basic and diluted earnings per share attributable to WESCO International in the fourth quarter of 2017.
(2) | Earnings per share (EPS) in each quarter is computed using the weighted-average number of shares outstanding during that quarter while EPS for the full year is computed by using the weighted-average number of shares outstanding during the year. Thus, the sum of the four quarters’ EPS may not equal the full-year EPS.
(3) | Diluted EPS in each quarter is computed using the weighted-average number of shares outstanding and common share equivalents during that quarter while Diluted EPS for the full year is computed by using the weighted-average number of shares outstanding and common share equivalents during the year. Thus, the sum of the four quarters’ Diluted EPS may not equal the full-year Diluted EPS.
(4) | On September 15, 2016, the Company completed the redemption of its 2029 Debentures. The redemption resulted in a non-cash charge of $123.9 million and consequently a net loss attributable to WESCO International for the three months ended September 30, 2016. Accordingly, dilutive shares were not included in the calculation of diluted loss per share for the three months ended September 30, 2016 because their effect was antidilutive. As described in Note 9, net income and net income attributable to WESCO International include provisional discrete income tax expense of $26.4 million resulting from the application of the TCJA, which affected basic and diluted earnings per share attributable to WESCO International in the fourth quarter of 2017.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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