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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Schedule of selected quarterly financial data | The following table sets forth selected quarterly financial data for each of the quarters in 2017 and 2016, respectively: (in thousands, except per share amounts)
| 2017 |  | 2016
| Fourth Quarter |  | Third Quarter |  | Second Quarter |  | First Quarter |  | Fourth Quarter |  | Third Quarter |  | Second Quarter |  | First Quarter
Net sales | $ | 231,681 |  |  | $ | 262,476 |  |  | $ | 263,002 |  |  | $ | 219,866 |  |  | $ | 200,192 |  |  | $ | 230,974 |  |  | $ | 229,973 |  |  | $ | 199,523 |
Cost of sales | 128,983 |  |  | 142,591 |  |  | 139,477 |  |  | 119,710 |  |  | 105,226 |  |  | 117,499 |  |  | 118,486 |  |  | 107,000 |
Gross profit | 102,698 |  |  | 119,885 |  |  | 123,525 |  |  | 100,156 |  |  | 94,966 |  |  | 113,475 |  |  | 111,487 |  |  | 92,523 |
Research and development and other engineering | 12,565 |  |  | 8,679 |  |  | 13,264 |  |  | 13,108 |  |  | 12,441 |  |  | 10,932 |  |  | 11,452 |  |  | 11,423 |
Selling | 28,753 |  |  | 28,156 |  |  | 28,511 |  |  | 29,483 |  |  | 24,030 |  |  | 24,304 |  |  | 24,822 |  |  | 25,187 |
General and administrative | 36,688 |  |  | 36,501 |  |  | 36,563 |  |  | 34,986 |  |  | 32,376 |  |  | 32,543 |  |  | 34,945 |  |  | 29,298 |
Gain (loss) on sale of assets | (13 | ) |  | (147 | ) |  | 50 |  |  | (50 | ) |  | (17 | ) |  | (81 | ) |  | (656 | ) |  | (26 | )
Income from operations | 24,705 |  |  | 46,696 |  |  | 45,137 |  |  | 22,629 |  |  | 26,136 |  |  | 45,777 |  |  | 40,924 |  |  | 26,641 |
Loss in equity method investment, before tax | (33 | ) |  | (13 | ) |  | (12 | ) |  | (28 | ) |  | — |  |  | — |  |  | — |  |  | — |
Interest (expense) income, net | (104 | ) |  | (296 | ) |  | (199 | ) |  | (189 | ) |  | (177 | ) |  | (82 | ) |  | (83 | ) |  | (235 | )
Gain (adjustment) on bargain purchase of a business | — |  |  | (2,052 | ) |  | — |  |  | 8,388 |  |  | — |  |  | — |  |  | — |  |  | — |
Gain (loss) on disposal of a business | (654 | ) |  | 443 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Provision for income taxes | 10,829 |  |  | 16,581 |  |  | 16,712 |  |  | 7,679 |  |  | 8,565 |  |  | 15,898 |  |  | 14,640 |  |  | 10,063 |
Net income | $ | 13,085 |  |  | $ | 28,197 |  |  | $ | 28,214 |  |  | $ | 23,121 |  |  | $ | 17,394 |  |  | $ | 29,797 |  |  | $ | 26,201 |  |  | $ | 16,343 |
Earnings per share of common stock: |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.28 |  |  | $ | 0.60 |  |  | $ | 0.59 |  |  | $ | 0.49 |  |  | $ | 0.37 |  |  | $ | 0.62 |  |  | $ | 0.54 |  |  | $ | 0.34 |
Diluted | 0.27 |  |  | 0.59 |  |  | 0.59 |  |  | 0.48 |  |  | 0.36 |  |  | 0.62 |  |  | 0.54 |  |  | 0.34 |
Cash dividends declared per share of common stock | $ | — |  |  | $ | 0.42 |  |  | $ | 0.21 |  |  | $ | 0.18 |  |  | $ | 0.18 |  |  | $ | 0.18 |  |  | $ | 0.18 |  |  | $ | 0.16 |

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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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