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Trade Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Receivables [Abstract]      
Trade accounts receivable $ 153,542 $ 116,368 $ 139,198
Allowance for doubtful accounts (1,284) (895) (918)
Allowance for sales discounts and returns (3,752) (3,050) (3,157)
Trade accounts receivable, net $ 148,506 $ 112,423 $ 135,123