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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Inventories [Abstract]    
Raw materials $ 416,050 $ 372,627
Work in progress 187,479 177,016
Finished goods 330,466 309,048
Subtotal 933,995 858,691
Less LIFO reserve 53,552 55,345
Total $ 880,443 $ 803,346