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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
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 2015 and 2014: (in thousands, except per share amounts)
| 2015 |  | 2014
| Fourth Quarter |  | Third Quarter |  | Second Quarter |  | First Quarter |  | Fourth Quarter |  | Third Quarter |  | Second Quarter |  | First Quarter
Net sales | $ | 184,764 |  |  | $ | 216,139 |  |  | $ | 216,665 |  |  | $ | 176,491 |  |  | $ | 166,630 |  |  | $ | 209,320 |  |  | $ | 207,893 |  |  | $ | 168,305 |
Cost of sales | 102,002 |  |  | 115,798 |  |  | 118,347 |  |  | 98,993 |  |  | 93,833 |  |  | 113,767 |  |  | 111,993 |  |  | 90,525 |
Gross profit | 82,762 |  |  | 100,341 |  |  | 98,318 |  |  | 77,498 |  |  | 72,797 |  |  | 95,553 |  |  | 95,900 |  |  | 77,780 |
Research and development and other engineering | 11,548 |  |  | 13,935 |  |  | 10,517 |  |  | 10,197 |  |  | 9,513 |  |  | 9,711 |  |  | 10,094 |  |  | 9,700 |
Selling | 22,508 |  |  | 22,535 |  |  | 23,013 |  |  | 22,607 |  |  | 22,407 |  |  | 23,592 |  |  | 24,213 |  |  | 21,819 |
General and administrative | 26,553 |  |  | 28,648 |  |  | 29,794 |  |  | 28,433 |  |  | 25,508 |  |  | 29,557 |  |  | 29,494 |  |  | 26,941 |
Impairment of goodwill | — |  |  | — |  |  | — |  |  |  |  |  | 38 |  |  | 492 |  |  | — |  |  | — |
Loss (gain) on sale of assets | (332 | ) |  | (26 | ) |  | (15 | ) |  | (16 | ) |  | 11 |  |  | (17 | ) |  | (34 | ) |  | (285 | )
Income from operations | 22,485 |  |  | 35,249 |  |  | 35,009 |  |  | 16,277 |  |  | 15,320 |  |  | 32,218 |  |  | 32,133 |  |  | 19,605 |
Interest income (expense), net | (77 | ) |  | (175 | ) |  | (54 | ) |  | (35 | ) |  | 2 |  |  | (27 | ) |  | (15 | ) |  | 86 |
Income before income taxes | 22,408 |  |  | 35,074 |  |  | 34,955 |  |  | 16,242 |  |  | 15,322 |  |  | 32,191 |  |  | 32,118 |  |  | 19,691 |
Provision for income taxes | 7,675 |  |  | 13,479 |  |  | 13,446 |  |  | 6,191 |  |  | 4,942 |  |  | 11,577 |  |  | 11,667 |  |  | 7,605 |
Net income | $ | 14,733 |  |  | $ | 21,595 |  |  | $ | 21,509 |  |  | $ | 10,051 |  |  | $ | 10,380 |  |  | $ | 20,614 |  |  | $ | 20,451 |  |  | $ | 12,086 |
Earnings per common share: |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.30 |  |  | $ | 0.44 |  |  | $ | 0.44 |  |  | $ | 0.20 |  |  | $ | 0.21 |  |  | $ | 0.42 |  |  | $ | 0.42 |  |  | $ | 0.25 |
Diluted | 0.30 |  |  | 0.44 |  |  | 0.43 |  |  | 0.20 |  |  | 0.21 |  |  | 0.42 |  |  | 0.42 |  |  | 0.25 |
Cash dividends declared per common share | $ | 0.160 |  |  | $ | 0.160 |  |  | $ | 0.160 |  |  | $ | 0.140 |  |  | $ | 0.140 |  |  | $ | 0.140 |  |  | $ | 0.140 |  |  | $ | 0.125 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and 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=51825399&loc=d3e1280-108306 + Details
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