Business Segment and Foreign Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Revenues from Geographical Segments [Line Items]
Net sales	$ 162,110	$ 160,467	$ 147,551	$ 132,705	$ 138,389	$ 147,780	$ 146,315	$ 129,845	$ 602,833	$ 562,329	$ 529,354
United States [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Net sales									287,678	201,579	195,308
Asia (excluding PRC) [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Net sales									109,960	129,614	107,886
People's Republic of China [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Net sales									74,475	98,057	89,918
Europe [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Net sales									65,579	70,663	72,852
Latin America [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Net sales									38,985	38,912	35,179
All Other Countries [Member]
Schedule of Revenues from Geographical Segments [Line Items]
Net sales									$ 26,156	$ 23,504	$ 28,211