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v3.8.0.1

Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 231,681 | $ 262,476 | $ 263,002 | $ 219,866 | $ 200,192 | $ 230,974 | $ 229,973 | $ 199,523 | $ 977,025 | $ 860,661 | $ 794,059
Cost of sales | 128,983 | 142,591 | 139,477 | 119,710 | 105,226 | 117,499 | 118,486 | 107,000 | 530,761 | 448,211 | 435,140
Gross profit | 102,698 | 119,885 | 123,525 | 100,156 | 94,966 | 113,475 | 111,487 | 92,523 | 446,264 | 412,450 | 358,919
Research and development and other engineering | 12,565 | 8,679 | 13,264 | 13,108 | 12,441 | 10,932 | 11,452 | 11,423 | 47,616 | 46,248 | 46,196
Selling | 28,753 | 28,156 | 28,511 | 29,483 | 24,030 | 24,304 | 24,822 | 25,187 | 114,903 | 98,343 | 90,663
General and administrative | 36,688 | 36,501 | 36,563 | 34,986 | 32,376 | 32,543 | 34,945 | 29,298 | 144,738 | 129,162 | 113,428
Gain (loss) on sale of assets | (13) | (147) | 50 | (50) | (17) | (81) | (656) | (26) | (160) | (780) | (389)
Income from operations | 24,705 | 46,696 | 45,137 | 22,629 | 26,136 | 45,777 | 40,924 | 26,641 | 139,167 | 139,477 | 109,021
Loss in equity method investment, before tax | (33) | (13) | (12) | (28) |  |  |  |  | (86) | 0 | 0
Interest income, net | (104) | (296) | (199) | (189) | (177) | (82) | (83) | (235) |  |  |
Gain (loss) on bargain purchase of a business (adjustment) | 0 | (2,052) | 0 | 8,388 |  |  |  |  |  |  |
Loss on disposal of a business | (654) | 443 | 0 | 0 |  |  |  |  | (211) | 0 | 0
Income before taxes |  |  |  |  |  |  |  |  | 144,418 | 138,900 | 108,679
Provision for (benefit from) income taxes | 10,829 | 16,581 | 16,712 | 7,679 | 8,565 | 15,898 | 14,640 | 10,063 | 51,801 | 49,166 | 40,791
Net income | $ 13,085 | $ 28,197 | $ 28,214 | $ 23,121 | $ 17,394 | $ 29,797 | $ 26,201 | $ 16,343 | $ 92,617 | $ 89,734 | $ 67,888
Earnings per share of common stock: |  |  |  |  |  |  |  |  |  |  |
Basic (in USD per share) | $ 0.28 | $ 0.60 | $ 0.59 | $ 0.49 | $ 0.37 | $ 0.62 | $ 0.54 | $ 0.34 | $ 1.95 | $ 1.87 | $ 1.39
Diluted (in USD per share) | 0.27 | 0.59 | 0.59 | 0.48 | 0.36 | 0.62 | 0.54 | 0.34 | 1.94 | 1.86 | 1.38
Cash dividends declared per common share (in dollars per share) | $ 0 | $ 0.42 | $ 0.21 | $ 0.18 | $ 0.18 | $ 0.180 | $ 0.180 | $ 0.160 | $ 0.81 | $ 0.70 | $ 0.62

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