Inventory (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Components of inventories
Raw materials	$ 59,800,000	$ 59,000,000
Work in process	165,600,000	142,200,000
Finished goods	82,900,000	87,900,000
Total inventory	$ 308,254,000	$ 289,066,000