Inventory (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Components of inventories
Raw materials	$ 83,800,000	$ 59,000,000
Work in process	169,400,000	142,200,000
Finished goods	73,600,000	87,900,000
Total inventory	$ 326,843,000	$ 289,066,000