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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Selected Quarterly Financial Data | Selected quarterly financial data for 2018 and 2017 are as follows:
| Three Months Ended
| March |  | June |  | September(1) |  | December(2)
2018 |  |  |  |  |  |  |
Net sales | $ | 202,064 |  |  | $ | 212,820 |  |  | $ | 202,307 |  |  | $ | 242,444 |
Gross profit | 109,557 |  |  | 116,271 |  |  | 110,627 |  |  | 132,655 |
Net income | 10,657 |  |  | 8,719 |  |  | 5,825 |  |  | 15,653 |
EPS: |  |  |  |  |  |  |  |  |  |  |
Basic | $ | .38 |  |  | $ | .31 |  |  | $ | .21 |  |  | $ | .56 |
Diluted | .37 |  |  | .30 |  |  | .20 |  |  | .54 |
| Three Months Ended
| March(3) |  | June(4) |  | September(5) |  | December(6)
2017 |  |  |  |  |  |  |
Net sales | $ | 186,567 |  |  | $ | 197,154 |  |  | $ | 190,117 |  |  | $ | 222,555 |
Gross profit | 99,885 |  |  | 104,652 |  |  | 102,547 |  |  | 123,958 |
Net income (loss) | (4,545 | ) |  | 6,139 |  |  | 7,197 |  |  | 46,696 |
EPS: |  |  |  |  |  |  |  |  |  |  |
Basic | $ | (.16 | ) |  | $ | .22 |  |  | $ | .26 |  |  | $ | 1.67 |
Diluted | (.16 | ) |  | .22 |  |  | .26 |  |  | 1.65 |

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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=109225645&loc=d3e1280-108306 + Details
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