Inventories (Schedule Of Inventory Write-offs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Inventories [Line Items]
Inventory write-offs	$ 7,200	$ 7,584	$ 3,875
Pre-Launch Inventories [Member]
Inventories [Line Items]
Inventory write-offs	$ 1,607	$ 102	$ 318