XML 22 R12.htm IDEA: XBRL DOCUMENT v3.19.1
Trade Accounts Receivable, Net
 3 Months Ended
Mar. 31, 2019
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)
2019
 
2018
 
2018
Trade accounts receivable
$
176,896

 
$
169,552

 
$
149,886

Allowance for doubtful accounts
(1,195
)
 
(1,217
)
 
(1,364
)
Allowance for sales discounts and returns
(2,561
)
 
(1,189
)
 
(2,470
)
 
$
173,140

 
$
167,146

 
$
146,052