Inventories (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Inventories
Raw materials and supplies	$ 173,166,000	$ 118,691,000
Work in process	168,685,000	160,368,000
Finished goods	63,901,000	64,075,000
Inventory, gross, total	405,752,000	343,134,000
Reserves	(3,710,000)	(2,716,000)
Inventory, net, total	402,042,000	340,418,000
Costs in excess of normal absorption	$ 500,000	$ 1,400,000