Business Segment and Foreign Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	$ 138,389	$ 147,780	$ 146,315	$ 129,845	$ 136,134	$ 142,389	$ 136,109	$ 114,722	$ 562,329	$ 529,354	$ 463,090
United States [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales									201,579	195,308	165,209
Asia (excluding PRC) [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales									129,614	107,886	108,979
People's Republic of China [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales									98,057	89,918	76,873
Europe [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales									70,663	72,852	61,617
Latin America [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales									38,912	35,179	28,677
All Other Countries [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales									$ 23,504	$ 28,211	$ 21,735