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Trade Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Receivables [Abstract]      
Trade accounts receivable $ 169,552 $ 139,910 $ 153,542
Allowance for doubtful accounts (1,217) (996) (1,284)
Allowance for sales discounts and returns (1,189) (2,956) (3,752)
Trade accounts receivable, net 167,146 $ 135,958 $ 148,506
Adjustment in recognition $ 1,100