Inventory (Schedule Of Inventory) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Inventory [Line Items]
Raw materials	$ 15,267	$ 11,174
Work-in-process	58,541	65,336
Finished goods	41,820	33,188
Total inventory	115,628	109,698	[1]
Naglazyme Product [Member]
Inventory [Line Items]
Total inventory	$ 12,600	$ 14,800

[1] December 31, 2010 balances were derived from the audited consolidated financial statements.