v3.8.0.1

Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Summary of Unaudited Quarterly Financial Information | The following is a summary of the unaudited quarterly financial information for the two years ended December 31, 2017 and 2016 (in thousands, except per share data):
| Three Months Ended
2017 | March 31 |  | June 30 |  | September 30 |  | December 31
Net sales | $ | 279,392 |  |  | $ | 291,534 |  |  | $ | 292,030 |  |  | $ | 301,292 |
Gross profit | 39,205 |  |  | 35,872 |  |  | 39,087 |  |  | 42,011 |
Net income | 13,632 |  |  | 10,933 |  |  | 13,964 |  |  | 28,488 |
Earnings per common share – basic | 0.66 |  |  | 0.53 |  |  | 0.67 |  |  | 1.37 |
Earnings per common share – diluted | 0.65 |  |  | 0.52 |  |  | 0.67 |  |  | 1.36 |
| Three Months Ended
2016 | March 31 |  | June 30 |  | September 30 |  | December 31
Net sales | $ | 225,544 |  |  | $ | 238,831 |  |  | $ | 237,168 |  |  | $ | 239,247 |
Gross profit | 30,143 |  |  | 28,631 |  |  | 27,818 |  |  | 33,525 |
Net income | 8,599 |  |  | 7,839 |  |  | 5,999 |  |  | 11,402 |
Earnings per common share – basic | 0.42 |  |  | 0.38 |  |  | 0.29 |  |  | 0.55 |
Earnings per common share – diluted | 0.41 |  |  | 0.38 |  |  | 0.29 |  |  | 0.55 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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