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Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly financial information |
| 2018
(Dollars in thousands, except per share amounts) | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Net sales | $ | 214,611 |  |  | $ | 214,675 |  |  | $ | 226,863 |  |  | $ | 222,942 |
Gross margin | $ | 76,606 |  |  | $ | 76,672 |  |  | $ | 79,130 |  |  | $ | 78,375 |
Net income | $ | 26,136 |  |  | $ | 17,329 |  |  | $ | 19,734 |  |  | $ | 24,452 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 1.43 |  |  | $ | 0.94 |  |  | $ | 1.07 |  |  | $ | 1.33 |
Diluted | $ | 1.40 |  |  | $ | 0.93 |  |  | $ | 1.06 |  |  | $ | 1.31 |
(Dollars in thousands, except per share amounts) | 2017
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Net sales | $ | 203,828 |  |  | $ | 201,424 |  |  | $ | 206,783 |  |  | $ | 209,008 |
Gross margin | $ | 80,350 |  |  | $ | 80,546 |  |  | $ | 82,188 |  |  | $ | 75,491 |
Net income | $ | 27,032 |  |  | $ | 20,896 |  |  | $ | 25,532 |  |  | $ | 6,999 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | 1.50 |  |  | $ | 1.15 |  |  | $ | 1.40 |  |  | $ | 0.38 |
Diluted | $ | 1.47 |  |  | $ | 1.13 |  |  | $ | 1.37 |  |  | $ | 0.37 |

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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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