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SELECTED QUARTERLY FINANCIAL DATA (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2014 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  | $ (123,900) | $ (123,933) | $ 0 | $ 0
Net sales | $ 1,793,262 | $ 1,855,212 | $ 1,911,582 | $ 1,775,961 | $ 1,861,540 | $ 1,923,899 | $ 1,916,718 | $ 1,816,330 |  | 7,336,017 | 7,518,487 | 7,889,626
Cost of goods sold | 1,444,735 | 1,490,173 | 1,532,113 | 1,420,793 | 1,497,990 | 1,543,113 | 1,535,084 | 1,448,639 |  | 5,887,814 | 6,024,826 | 6,278,584
Income from operations | 82,009 | 92,555 | 87,987 | 69,508 | 89,956 | 106,348 | 90,253 | 87,185 |  | 332,059 | 373,742 | 466,217
Income before income taxes | 64,507 | (52,170) | 68,535 | 50,679 | 80,048 | 85,931 | 71,640 | 66,291 |  | 131,551 | 303,910 | 384,153
Net income | 47,755 | (31,021) | 49,852 | 34,534 | 48,557 | 62,384 | 50,639 | 46,793 |  | 101,120 | 208,373 | 275,437
Net Income attributable to WESCO International, Inc. | $ 47,348 | $ (31,611) | $ 49,798 | $ 36,053 | $ 48,412 | $ 63,503 | $ 51,741 | $ 47,031 |  | $ 101,588 | $ 210,687 | $ 275,906
Basic earnings per share attributable to WESCO International, Inc. | $ 0.97 | $ (0.73) | $ 1.18 | $ 0.85 | $ 1.15 | $ 1.47 | $ 1.18 | $ 1.06 |  | $ 2.30 | $ 4.85 | $ 6.21
Diluted earnings per share attributable to WESCO International, Inc. | $ 0.96 | $ (0.73) | $ 1.02 | $ 0.77 | $ 1.03 | $ 1.28 | $ 1.00 | $ 0.90 |  | $ 2.10 | $ 4.18 | $ 5.18

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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