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SELECTED QUARTERLY FINANCIAL DATA | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
SELECTED QUARTERLY FINANCIAL DATA | 19. SELECTED QUARTERLY FINANCIAL DATA (unaudited) The following table sets forth selected quarterly financial data for the years ended December 31, 2018 and 2017:
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2018 |  |  |  |  |  |  |
Net Sales | $ | 1,993,915 |  |  | $ | 2,103,994 |  |  | $ | 2,067,245 |  |  | $ | 2,011,447 |
Cost of goods sold (excluding depreciation and amortization) | 1,613,966 |  |  | 1,704,100 |  |  | 1,670,037 |  |  | 1,621,117 |
Income from operations | 73,241 |  |  | 91,183 |  |  | 97,517 |  |  | 90,499 |
Income before income taxes | 53,458 |  |  | 73,442 |  |  | 80,467 |  |  | 73,658 |
Net income | 42,971 |  |  | 57,673 |  |  | 66,645 |  |  | 58,066 |
Net income attributable to WESCO International | 44,421 |  |  | 57,940 |  |  | 66,849 |  |  | 58,133 |
Basic earnings per share attributable to WESCO International(2) | 0.94 |  |  | 1.23 |  |  | 1.42 |  |  | 1.27 |
Diluted earnings per share attributable to WESCO International(3) | 0.93 |  |  | 1.22 |  |  | 1.41 |  |  | 1.26 |
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 |
(1) | As described in Note 11, 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.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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