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Accounts Receivable (Narrative) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]    
Allowance for doubtful accounts $ 2,551 $ 2,501
Reserves for sales discounts    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Reserves for sales discounts on products shipped under promotional programs $ 13,663 $ 13,488