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Allowance for Doubtful Accounts
 12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Allowance for Doubtful Accounts Allowance for Doubtful Accounts
The Company estimates expected credit losses using a number of factors, including customer credit ratings, age of receivables, historical credit loss information and current and forecasted economic conditions (including the impact of the COVID-19 pandemic) which could affect the collectability of the reported amounts. All of these factors have been considered in the estimate of expected credit losses as of December 31, 2020.
The activity related to the allowance for doubtful accounts was as follows:
Year ended December 31,
(in thousands)202020192018
Balance at beginning of year$5,338 $7,272 $9,975 
Bad debt expense2,556 573 (583)
Amount of receivables written off(572)(2,706)(1,873)
Foreign currency translation and other376 199 (247)
Balance at end of year$7,698 $5,338 $7,272