Business Segment and Foreign Operations - Foreign Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	$ 161,406	$ 150,658
United States
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	81,928	83,938
Asia (excluding the PRC)
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	24,650	21,573
People's Republic of China (PRC)
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	15,743	16,926
Europe
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	17,424	15,783
Latin America
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	15,645	7,555
Other
Schedule of Revenues from Geographical Segments [Line Items]
Total net sales	$ 6,016	$ 4,883