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Trade Accounts Receivable, Net (Tables)
 3 Months Ended
Mar. 31, 2020
Receivables [Abstract]  
Schedule of trade accounts receivable, net
Trade accounts receivable at the dates indicated consisted of the following: 
 
At March 31,
 
At December 31,
(in thousands)
2020
 
2019
 
2019
Trade accounts receivable
$
174,853

 
$
176,896

 
$
144,729

Allowance for doubtful accounts
(2,761
)
 
(1,195
)
 
(1,935
)
Allowance for sales discounts and returns
(3,356
)
 
(2,561
)
 
(3,430
)
 
$
168,736

 
$
173,140

 
$
139,364