XML 19 R9.htm IDEA: XBRL DOCUMENT v3.8.0.1
Trade Accounts Receivable, Net
 9 Months Ended
Sep. 30, 2017
Receivables [Abstract]  
Trade Accounts Receivable, Net
Trade Accounts Receivable, Net
 
Trade accounts receivable at the dates indicated consisted of the following: 
 
At September 30,
 
At December 31,
(in thousands)
2017
 
2016
 
2016
Trade accounts receivable
$
165,101

 
$
145,966

 
$
116,368

Allowance for doubtful accounts
(1,166
)
 
(945
)
 
(895
)
Allowance for sales discounts and returns
(4,364
)
 
(3,305
)
 
(3,050
)
 
$
159,571

 
$
141,716

 
$
112,423