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Trade Accounts Receivable, Net
 6 Months Ended
Jun. 30, 2018
Receivables [Abstract]  
Trade Accounts Receivable, Net
Trade Accounts Receivable, Net
 
Trade accounts receivable at the dates indicated consisted of the following: 
 
At June 30,
 
At December 31,
(in thousands)
2018
 
2017
 
2017
Trade accounts receivable
$
215,174

 
$
178,241

 
$
139,910

Allowance for doubtful accounts
(1,223
)
 
(1,096
)
 
(996
)
Allowance for sales discounts and returns
(2,772
)
 
(4,814
)
 
(2,956
)
 
$
211,179

 
$
172,331

 
$
135,958


 
The decrease in allowance for sales discounts and returns is primarily related to the adoption of ASC 606 resulting in the reclassification of an estimated refund liability of $1.3 million from allowance for sales discounts and returns to other current liabilities.