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Summary Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | The Company's unaudited quarterly financial data is as follows (dollars in thousands, except for per share data):
|  | As of December 31, 2018
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Net sales |  | $ | 217,100 |  |  | $ | 224,910 |  |  | $ | 223,780 |  |  | $ | 211,350 |
Gross profit |  | 60,380 |  |  | 64,780 |  |  | 61,720 |  |  | 57,240 |
Net income |  | 24,320 |  |  | 19,600 |  |  | 22,670 |  |  | 16,710 |
Earnings per share—basic: |  |  |  |  |  |  |  |
Net income per share |  | $ | 0.53 |  |  | $ | 0.43 |  |  | $ | 0.49 |  |  | $ | 0.37 |
Weighted average shares—basic |  | 45,779,966 |  |  | 45,920,307 |  |  | 45,850,288 |  |  | 45,747,659 |
Earnings per share—diluted: |  |  |  |  |  |  |  |
Net income per share |  | $ | 0.53 |  |  | $ | 0.42 |  |  | $ | 0.49 |  |  | $ | 0.36 |
Weighted average shares—diluted |  | 46,229,337 |  |  | 46,200,757 |  |  | 46,166,558 |  |  | 46,085,202 |
|  | As of December 31, 2017
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Net sales |  | $ | 199,830 |  |  | $ | 213,370 |  |  | $ | 209,330 |  |  | $ | 195,210 |
Gross profit |  | 51,820 |  |  | 59,470 |  |  | 58,890 |  |  | 49,210 |
Net income (loss) |  | 6,990 |  |  | 14,850 |  |  | 13,130 |  |  | (4,010 | )
Earnings (loss) per share—basic: |  |  |  |  |  |  |  |
Net income (loss) per share |  | $ | 0.15 |  |  | $ | 0.32 |  |  | $ | 0.29 |  |  | $ | (0.09 | )
Weighted average shares—basic |  | 45,570,495 |  |  | 45,717,697 |  |  | 45,721,155 |  |  | 45,721,160 |
Earnings (loss) per share—diluted: |  |  |  |  |  |  |  |
Net income (loss) per share |  | $ | 0.15 |  |  | $ | 0.32 |  |  | $ | 0.29 |  |  | $ | (0.09 | )
Weighted average shares—diluted |  | 45,908,958 |  |  | 45,922,416 |  |  | 46,029,361 |  |  | 45,721,160 |

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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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