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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Inventories      
Raw materials $ 92,671 $ 81,338 $ 90,697
In-process products 19,822 18,475 18,118
Finished products 104,036 97,915 93,526
Total inventories $ 216,529 $ 197,728 $ 202,341