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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Components of inventories    
Finished products $ 70,092 $ 61,023
Raw materials 9,830 10,045
Total Inventories $ 79,922 $ 71,068 [1]
[1] The balance sheet at December 31, 2011 has been derived from the audited financial statements at that date.