CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net sales	$ 514,246	$ 535,004	$ 555,103
Cost of products sold (excluding depreciation and amortization)	346,398	343,522	363,014
Depreciation and amortization	38,070	35,453	30,470
Selling, general and administrative expenses	99,815	84,810	80,860
Research and development expenses	5,441	6,425	6,406
Restructuring income			(252)
Total costs and expenses	489,724	470,210	480,498
Income from operations	24,522	64,794	74,605
Interest income	99	58	77
Interest expense	(2,385)	(773)	(263)
Other expense - net	(2,163)	(693)	(1,911)
Income before income tax provision	20,073	63,386	72,508
Income tax provision (Note 14)	6,276	19,923	23,138
Net income	13,797	43,463	49,370
Other comprehensive income (loss), net of tax (Note 12)
Foreign currency translation	(10,956)	(13,013)	(14,850)
Defined benefit pension plans	(1,899)	(116)	(11,908)
Derivatives	886	(991)	388
Total other comprehensive loss	(11,969)	(14,120)	(26,370)
Total comprehensive income	$ 1,828	$ 29,343	$ 23,000
Net income per common share
Basic (in dollars per share)	$ 0.27	$ 0.84	$ 0.93
Diluted (in dollars per share)	0.27	0.82	0.92
Dividends per common share (in dollars per share)	$ 0.20	$ 0.20	$ 0
Weighted average shares outstanding
Basic (in shares)	50,259	51,902	53,042
Diluted (in shares)	51,023	52,709	53,941