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Trade Accounts Receivable, Net
6 Months Ended
Jun. 30, 2017
Receivables [Abstract]  
Trade Accounts Receivable, Net
Trade Accounts Receivable, Net
 
Trade accounts receivable at the dates indicated consisted of the following: 
 
At June 30,
 
At December 31,
(in thousands)
2017
 
2016
 
2016
Trade accounts receivable
$
178,241

 
$
149,400

 
$
116,368

Allowance for doubtful accounts
(1,096
)
 
(972
)
 
(895
)
Allowance for sales discounts and returns
(4,814
)
 
(3,512
)
 
(3,050
)
 
$
172,331

 
$
144,916

 
$
112,423