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Trade Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Receivables [Abstract]      
Trade accounts receivable $ 165,101 $ 116,368 $ 145,966
Allowance for doubtful accounts (1,166) (895) (945)
Allowance for sales discounts and returns (4,364) (3,050) (3,305)
Trade accounts receivable, net $ 159,571 $ 112,423 $ 141,716