Segment, Significant Customer and Geographic Information (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Geographic Information
Long-lived assets	$ 50,263	$ 58,228
Geographic net sales	358,819	326,248	283,501
Reporting segment | United States
Geographic Information
Long-lived assets	45,773	52,425
Geographic net sales	299,018	267,736	240,453
Reporting segment | International
Geographic Information
Long-lived assets	4,490	5,803
Geographic net sales	$ 59,801	$ 58,512	$ 43,048