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Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Summarized Quarterly Results of Operations | 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 Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: 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 + Details
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