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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Inventory Disclosure [Abstract]      
Raw materials $ 90,545 $ 86,524 $ 82,056
In-process products 26,010 20,902 20,827
Finished products 139,716 124,848 107,904
Total inventories $ 256,271 $ 232,274 $ 210,787