Consolidated Income Statements - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Gross sales	$ 491,538	$ 433,856	$ 374,150
Commissions, allowances and rebates	2,369	1,949	2,306
Net sales	489,169	431,907	371,844
Other revenue, net	1,475	1,419	2,769
Net revenues	490,644	433,326	374,613
Cost of goods sold	286,419	256,361	250,815
Gross profit	204,225	176,965	123,798
Selling, general and administrative expenses	60,422	57,867	52,489
Research and development expenses	14,292	12,540	13,075
Restructuring expenses	1,158	15,573
Operating expenses	75,872	85,980	65,564
Loss on voluntary pension settlement			7,170
Gain on sale of asset			(1,234)
Operating profit	128,353	90,985	52,298
Other expenses/(income)
Interest expense, net	717	1,699	2,174
Equity in losses of partially-owned affiliates			4,623
Other expenses/(income), net	97	(279)	(5)
Income before income taxes	127,539	89,565	45,506
Provision/(benefit) for income taxes	40,214	32,389	(12,627)
Income from continuing operations	87,325	57,176	58,133
(Loss)/income from discontinued operations, net of tax	(5,647)	41	(830)
Net income	$ 81,678	$ 57,217	$ 57,303
Basic earnings per share
Income from continuing operations (in dollars per share)	$ 2.72	$ 1.82	$ 1.89
(Loss)/income from discontinued operations, net of tax (in dollars per share)	(0.17)	0	(0.03)
Net income (in dollars per share)	2.55	1.82	1.86
Diluted earnings per share
Income from continuing operations (in dollars per share)	2.65	1.76	1.84
(Loss)/income from discontinued operations, net of tax (in dollars per share)	(0.17)	0	(0.03)
Net income (in dollars per share)	$ 2.48	$ 1.76	$ 1.81
Weighted average shares outstanding:
Basic weighted average shares outstanding (in shares)	32,086	31,420	30,763
Effect of dilutive stock based compensation (in shares)	883	1,135	880
Diluted weighted average shares outstanding (in shares)	32,969	32,555	31,643