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Trade Accounts Receivable, Net
 3 Months Ended
Jun. 30, 2020
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)
2020
 
2019
 
2019
Trade accounts receivable
$
239,220

 
$
195,767

 
$
144,729

Allowance for doubtful accounts
(2,007
)
 
(1,279
)
 
(1,935
)
Allowance for sales discounts and returns
(3,346
)
 
(3,206
)
 
(3,430
)
 
$
233,867

 
$
191,282

 
$
139,364