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Trade Accounts Receivable, Net (Tables)
 9 Months Ended
Sep. 30, 2019
Receivables [Abstract]  
Schedule of trade accounts receivable, net
Trade accounts receivable at the dates indicated consisted of the following: 
 
At September 30,
 
At December 31,
(in thousands)
2019
 
2018
 
2018
Trade accounts receivable
$
186,219

 
$
197,378

 
$
149,886

Allowance for doubtful accounts
(1,434
)
 
(1,312
)
 
(1,364
)
Allowance for sales discounts and returns
(3,887
)
 
(3,085
)
 
(2,470
)
 
$
180,898

 
$
192,981

 
$
146,052