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Trade Accounts Receivable, Net
3 Months Ended
Sep. 30, 2020
Receivables [Abstract]  
Trade Accounts Receivable, Net Trade Accounts Receivable, Net
 
Trade accounts receivable at the dates indicated consisted of the following: 
 At September 30,At December 31,
(in thousands)
202020192019
Trade accounts receivable
$231,559 $186,219 $144,729 
Allowance for doubtful accounts
(2,032)(1,434)(1,935)
Allowance for sales discounts and returns
(3,080)(3,887)(3,430)
 $226,447 $180,898 $139,364