CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net sales	$ 152,998	$ 132,597	$ 295,701	$ 252,796
Cost of products sold (excluding depreciation and amortization)	106,286	87,663	205,101	166,122
Depreciation and amortization	12,000	9,461	23,788	18,236
Selling, general and administrative expenses	22,453	21,984	47,270	44,966
Research and development expenses	1,238	1,318	2,623	2,838
Total costs and expenses	141,977	120,426	278,782	232,162
Income from operations	11,021	12,171	16,919	20,634
Interest income	26	29	32	35
Interest expense	(2,021)	(228)	(3,535)	(561)
Other income (expense) — net	5	(20)	505	203
Income before income tax provision	9,031	11,952	13,921	20,311
Income tax provision (Note 14)	3,178	4,056	7,293	6,957
Net income	5,853	7,896	6,628	13,354
Other comprehensive income (loss), net of tax (Note 12)
Foreign currency translation	9,382	(3,408)	11,891	(311)
Defined benefit pension plans	175	739	592	1,263
Derivatives	(756)	1	(1,268)	(789)
Total other comprehensive income (loss)	8,801	(2,668)	11,215	163
Total comprehensive income	$ 14,654	$ 5,228	$ 17,843	$ 13,517
Net income per common share
Basic (in dollars per share)	$ 0.12	$ 0.16	$ 0.13	$ 0.27
Diluted (in dollars per share)	0.12	0.15	0.13	0.26
Dividends per common share (in dollars per share)	$ 0.05	$ 0.05	$ 0.10	$ 0.10
Weighted average shares outstanding
Basic (in shares)	50,470	50,225	50,441	50,267
Diluted (in shares)	50,511	50,987	50,499	51,014