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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Inventory Disclosure [Abstract]      
Raw materials $ 77,845 $ 81,338 $ 75,032
In-process products 19,646 18,475 18,070
Finished products 100,929 97,915 94,153
Total inventories $ 198,420 $ 197,728 $ 187,255