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Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Statement [Abstract] |  |  |  |
Net sales | $ 554,814 | $ 412,370 | $ 1,600,633 | $ 1,275,999
Cost of sales | 433,594 | 306,820 | 1,224,312 | 945,104
Gross profit | 121,220 | 105,550 | 376,321 | 330,895
Selling, general and administrative expenses | 73,293 | 60,412 | 206,225 | 170,641
Operating profit | 47,927 | 45,138 | 170,096 | 160,254
Interest expense, net | 311 | 396 | 1,162 | 1,285
Income before income taxes | 47,616 | 44,742 | 168,934 | 158,969
Provision for income taxes | 15,478 | 14,898 | 53,514 | 55,597
Net income | $ 32,138 | $ 29,844 | $ 115,420 | $ 103,372
Net income per common share: |  |  |  |
Basic (in usd per share) | $ 1.28 | $ 1.21 | $ 4.62 | $ 4.20
Diluted (in usd per share) | $ 1.26 | $ 1.19 | $ 4.56 | $ 4.15
Weighted average common shares outstanding: |  |  |  |
Basic (in shares) | 25,060 | 24,724 | 24,993 | 24,587
Diluted (in shares) | 25,459 | 25,060 | 25,332 | 24,882

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: 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(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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