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Quarterly Financial Information (Unaudited) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information (Unaudited) | QUARTERLY FINANCIAL INFORMATION (UNAUDITED) 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 The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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