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Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | The following table sets forth selected financial information for all of the quarters during the years ended December 31, 2019 and 2018 (in thousands, except per share data):
| First |  | Second |  | Third |  | Fourth
| 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Net Sales | $ | 468,589 |  |  | $ | 465,420 |  |  | $ | 468,711 |  |  | $ | 454,981 |  |  | $ | 477,761 |  |  | $ | 460,253 |  |  | $ | 443,836 |  |  | $ | 453,409 |
Gross Profit | 169,645 |  |  | 172,628 |  |  | 176,538 |  |  | 172,804 |  |  | 180,321 |  |  | 172,990 |  |  | 161,805 |  |  | 172,044 |
Operating Income | 121,596 |  |  | 128,515 |  |  | 127,905 |  |  | 126,683 |  |  | 128,136 |  |  | 127,428 |  |  | 110,901 |  |  | 125,499 |
Net Income | 104,280 |  |  | 111,249 |  |  | 108,959 |  |  | 109,024 |  |  | 111,898 |  |  | 111,336 |  |  | 99,547 |  |  | 106,275 |
Earnings Per Share (Basic)(1) | $ | 0.40 |  |  | $ | 0.40 |  |  | $ | 0.42 |  |  | $ | 0.40 |  |  | $ | 0.44 |  |  | $ | 0.42 |  |  | $ | 0.39 |  |  | $ | 0.41 |
Earnings Per Share (Diluted)(1) | $ | 0.40 |  |  | $ | 0.40 |  |  | $ | 0.42 |  |  | $ | 0.40 |  |  | $ | 0.44 |  |  | $ | 0.42 |  |  | $ | 0.39 |  |  | $ | 0.41 |
(1)Basic and diluted earnings per share are computed independently for each quarter presented. Therefore the sum of quarterly basic and diluted per share information may not equal annual basis and diluted earnings per share.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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