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Trade Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Receivables [Abstract]      
Trade accounts receivable $ 145,966 $ 109,859 $ 136,748
Allowance for doubtful accounts (945) (1,142) (919)
Allowance for sales discounts and returns (3,305) (2,706) (3,102)
Trade accounts receivable, net $ 141,716 $ 106,011 $ 132,727