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Trade Accounts Receivable, Net
 3 Months Ended
Mar. 31, 2018
Receivables [Abstract]  
Trade Accounts Receivable, Net
Trade Accounts Receivable, Net
 
Trade accounts receivable at the dates indicated consisted of the following: 
 
At March 31,
 
At December 31,
(in thousands)
2018
 
2017
 
2017
Trade accounts receivable
$
169,552

 
$
153,542

 
$
139,910

Allowance for doubtful accounts
(1,217
)
 
(1,284
)
 
(996
)
Allowance for sales discounts and returns
(1,189
)
 
(3,752
)
 
(2,956
)
 
$
167,146

 
$
148,506

 
$
135,958


 
The decrease in allowance for sales discounts and returns is primarily related to the adoption of ASC 606 resulting in a $1.1 million adjustment in recognition of estimated right of returns assets on product sales and its corresponding estimated refund liability as of December 31, 2017, which was not recordable under previous revenue recognition guidance. This amount was estimated based upon the most likely amount of consideration to which the customer will be entitled. All estimates are based on historical experience, anticipated performance and the Company’s best judgment at the time to the extent it is probable that a significant reversal of revenue recognized will not occur. These estimates are reassessed periodically.