XML 21 R37.htm IDEA: XBRL DOCUMENT v2.4.0.6
Inventories (Components Of Inventories) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Inventories [Abstract]    
Raw materials $ 124,969 $ 126,489
Work in process 8,875 7,610
Finished goods 78,729 74,391
Supplies and materials 116,766 115,541
Inventories at FIFO or average cost 329,339 324,031
Excess of FIFO or average cost over LIFO cost (66,056) (69,356)
Inventories, net $ 263,283 $ 254,675