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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Inventory Disclosure [Abstract]      
Raw materials $ 90,541 $ 81,338 $ 85,490
In-process products 20,810 18,475 18,759
Finished products 107,685 97,915 91,998
Total inventories $ 219,036 $ 197,728 $ 196,247