CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net sales	$ 123,970	$ 132,976	$ 376,766	$ 404,131
Cost of products sold (excluding depreciation and amortization)	85,430	84,804	251,552	256,636
Depreciation and amortization	9,082	8,624	27,318	25,788
Selling, general and administrative expenses	18,929	20,713	63,895	62,813
Research and development expenses	1,236	1,867	4,074	4,841
Total costs and expenses	114,677	116,008	346,839	350,078
Income from operations	9,293	16,968	29,927	54,053
Interest income		6	35	51
Interest expense	(538)	(254)	(1,099)	(500)
Other income (expense) — net	(758)	890	(555)	(261)
Income before income tax provision	7,997	17,610	28,308	53,343
Income tax provision	1,612	5,504	8,569	17,596
Net income	6,385	12,106	19,739	35,747
Other comprehensive income (loss), net of tax (Note 8)
Foreign currency translation	(284)	(2,490)	(595)	(9,462)
Defined benefit pension plans	1,028	503	2,291	1,460
Derivatives	100	(559)	(689)	(677)
Total other comprehensive income (loss)	844	(2,546)	1,007	(8,679)
Total comprehensive income	$ 7,229	$ 9,560	$ 20,746	$ 27,068
Net income per common share
Basic (in dollars per share)	$ 0.13	$ 0.23	$ 0.39	$ 0.68
Diluted (in dollars per share)	0.13	0.23	0.39	0.67
Dividends per common share (in dollars per share)	$ 0.05	$ 0.05	$ 0.15	$ 0.15
Weighted average shares outstanding, in thousands
Basic (in shares)	50,246	51,891	50,260	52,217
Diluted (in shares)	50,984	52,634	51,004	53,045