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Trade Accounts Receivable, Net
 6 Months Ended
Jun. 30, 2016
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)
2016
 
2015
 
2015
Trade accounts receivable
$
149,400

 
$
144,935

 
$
109,859

Allowance for doubtful accounts
(972
)
 
(829
)
 
(1,142
)
Allowance for sales discounts and returns
(3,512
)
 
(3,161
)
 
(2,706
)
 
$
144,916

 
$
140,945

 
$
106,011