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Business Segment and Foreign Operations - Foreign Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	$ 175,652	$ 169,185	$ 514,638	$ 490,829
United States
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	85,762	88,243	253,259	263,053
Asia (excluding the PRC)
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	26,113	22,099	77,679	64,290
People's Republic of China (PRC)
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	23,437	19,899	61,015	59,978
Europe
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	18,877	19,389	56,041	53,716
Latin America
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	13,567	13,032	44,593	32,273
Other
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	$ 7,896	$ 6,523	$ 22,051	$ 17,519

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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