Major Customers (Schedule Of Sales To Largest Customers) (Details) (International Business Machines Corporation [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
International Business Machines Corporation [Member]
Revenue, Major Customer [Line Items]
Sales to our largest customers	$ 506,126	$ 319,411		[1]

[1] amount is less than 10% of total sales