XML 34 R24.htm IDEA: XBRL DOCUMENT v3.10.0.1
Trade Accounts Receivable, Net (Tables)
 6 Months Ended
Jun. 30, 2018
Receivables [Abstract]  
Schedule of 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