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Trade Accounts Receivable, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Receivables [Abstract]    
Trade accounts receivable $ 116,368 $ 109,859
Allowance for doubtful accounts (895) (1,142)
Allowance for sales discounts (3,050) (2,706)
Trade accounts receivable, net $ 112,423 $ 106,011