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Accounts Receivable (Narrative) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]    
Allowance for doubtful accounts $ 3,550 $ 3,484
Reserves for sales discounts    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Reserves for sales discounts on products shipped under promotional programs $ 17,838 $ 15,094