Business Segment and Foreign Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule of Net Sales to External Customers by Geographic Area
Total net sales	$ 136,109	$ 116,704	$ 250,831	$ 220,436
United States [Member]
Schedule of Net Sales to External Customers by Geographic Area
Total net sales	47,979	40,129	92,747	74,349
Asia (excluding PRC) [Member]
Schedule of Net Sales to External Customers by Geographic Area
Total net sales	29,575	32,857	51,735	61,519
People's Republic of China [Member]
Schedule of Net Sales to External Customers by Geographic Area
Total net sales	24,803	19,287	41,624	34,709
Europe [Member]
Schedule of Net Sales to External Customers by Geographic Area
Total net sales	17,992	14,982	33,521	28,134
Latin America [Member]
Schedule of Net Sales to External Customers by Geographic Area
Total net sales	8,887	5,109	16,710	12,141
All Other Countries [Member]
Schedule of Net Sales to External Customers by Geographic Area
Total net sales	$ 6,873	$ 4,340	$ 14,494	$ 9,584