Business Segments, Concentration of Business, and Credit Risk and Significant Customers (Details 3) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 International Net Sales	Mar. 31, 2011 International Net Sales	Mar. 31, 2012 Net Trade Accounts Receivable Customer One customer	Dec. 31, 2011 Net Trade Accounts Receivable Customer One customer	Mar. 31, 2012 Long-lived assets Minimum	Dec. 31, 2011 Long-lived assets Minimum	Mar. 31, 2012 Net sales	Mar. 31, 2012 US Long-lived assets	Dec. 31, 2011 US Long-lived assets	Mar. 31, 2012 All other countries Long-lived assets	Dec. 31, 2011 All other countries Long-lived assets
Long-lived assets, which consist of property and equipment, by major country
Property and equipment, by major country	$ 94,019	$ 90,257								$ 67,857	$ 65,034	$ 26,162	$ 25,223
Concentration risks
Number of customers considered concentration risk					1	1
Concentration risk (as a percent)					10.00%	17.10%	10.00%	10.00%	10.00%
Concentration risk benchmark (as a percent)			30.80%	27.70%