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Quarterly Results of Operations (Unaudited) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Results of Operations (Unaudited) | Quarterly Results of Operations (Unaudited) The unaudited quarterly results of operations for the years ended December 31, 2015 and 2014 are as follows:
| 2015 Quarters |  | 2014 Quarters
| First |  | Second |  | Third |  | Fourth |  | First |  | Second |  | Third |  | Fourth
| (In thousands, except per share amounts)
Net sales | $ | 502,198 |  |  | $ | 514,881 |  |  | $ | 503,791 |  |  | $ | 499,798 |  |  | $ | 543,996 |  |  | $ | 546,693 |  |  | $ | 533,179 |  |  | $ | 523,899 |
Gross profit | 226,041 |  |  | 231,615 |  |  | 223,260 |  |  | 223,399 |  |  | 244,420 |  |  | 241,132 |  |  | 234,646 |  |  | 229,117 |
Operating income | 101,757 |  |  | 109,909 |  |  | 121,813 |  |  | 98,259 |  |  | 113,835 |  |  | 112,088 |  |  | 110,847 |  |  | 94,454 |
Net income | 65,954 |  |  | 69,585 |  |  | 79,505 |  |  | 67,763 |  |  | 74,548 |  |  | 71,777 |  |  | 71,441 |  |  | 61,620 |
Basic EPS | $ | 0.84 |  |  | $ | 0.89 |  |  | $ | 1.03 |  |  | $ | 0.89 |  |  | $ | 0.92 |  |  | $ | 0.89 |  |  | $ | 0.89 |  |  | $ | 0.78 |
Diluted EPS | $ | 0.84 |  |  | $ | 0.89 |  |  | $ | 1.02 |  |  | $ | 0.88 |  |  | $ | 0.91 |  |  | $ | 0.88 |  |  | $ | 0.88 |  |  | $ | 0.77 |
Basic weighted average shares outstanding | 77,996 |  |  | 77,466 |  |  | 76,831 |  |  | 76,211 |  |  | 80,527 |  |  | 80,106 |  |  | 79,558 |  |  | 78,669 |
Diluted weighted average shares outstanding | 78,856 |  |  | 78,297 |  |  | 77,646 |  |  | 77,091 |  |  | 81,575 |  |  | 81,149 |  |  | 80,561 |  |  | 79,632 |

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e725-108305 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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