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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Inventory Disclosure [Abstract]      
Raw materials $ 87,100 $ 86,524 $ 83,613
In-process products 26,248 20,902 20,313
Finished products 131,128 124,848 116,281
Total inventories $ 244,476 $ 232,274 $ 220,207