XML 41 R23.htm IDEA: XBRL DOCUMENT v3.19.1
Trade accounts receivable - net (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable
The following table represents the activity occurring in the reserves for doubtful accounts in 2018, 2017 and 2016.
 
(in thousands)
 
Beginning

Balance

at January 1
 
 
Net additions

charged to

Operations
 
 
Deductions

and Other
 
 
Ending Balance

at December 31
 
2018
 
$
722
 
 
$
479
 
 
$
(23
)
 
$
1,178
 
2017
 
$
365
 
 
$
136
 
 
$
221
 
 
$
722
 
2016
 
$
335
 
 
$
21
 
 
$
9
 
 
$
365