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Trade Accounts Receivable, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Receivables [Abstract]    
Trade accounts receivable $ 149,886 $ 139,910
Allowance for doubtful accounts (1,364) (996)
Allowance for sales discounts (2,470) (2,956)
Trade accounts receivable, net 146,052 $ 135,958
Contract with Customer, Refund Liability $ 800