Business Segment and Foreign Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	$ 147,551	$ 146,315	$ 280,256	$ 276,160
United States [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	62,349	50,662	117,108	98,558
Asia (excluding PRC) [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	30,645	32,114	61,665	63,632
People's Republic of China [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	21,368	29,087	37,204	49,757
Europe [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	16,112	19,244	31,134	34,515
Latin America [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	10,396	10,613	20,918	19,638
All Other Countries [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	$ 6,681	$ 4,595	$ 12,227	$ 10,060