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Trade Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Receivables [Abstract]      
Trade accounts receivable $ 197,378 $ 139,910 $ 165,101
Allowance for doubtful accounts (1,312) (996) (1,166)
Allowance for sales discounts and returns (3,085) (2,956) (4,364)
Trade accounts receivable, net 192,981 $ 135,958 $ 159,571
Estimated refund liability $ 1,100