Inventory (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Components of inventories
Raw materials	$ 101,800,000	$ 83,800,000
Work in process	230,500,000	169,400,000
Finished goods	115,100,000	73,600,000
Total inventory	$ 447,373,000	$ 326,843,000