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Trade accounts receivable - net (Tables)
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable
The following table represents the activity occurring in the reserves for doubtful accounts in 2016, 2015 and 2014.
 
 
 
Beginning Balance
 
Net additions charged to
 
Deductions and Other
 
Ending Balance
 
(in thousands)
 
at January 1
 
Operations
 
(1)
 
at December 31
 
2016
 
$
335
 
$
21
 
$
9
 
$
365
 
2015
 
$
244
 
$
99
 
$
(8)
 
$
335
 
2014
 
$
227
 
$
31
 
$
(14)
 
$
244
 
 
(1)
2016 includes a reclassification adjustment not affecting operations