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Trade Accounts Receivable (Tables)
 3 Months Ended
Mar. 31, 2021
Trade Accounts Receivable [Abstract]  
Changes in Allowance for Doubtful Accounts
The following table summarizes the changes in the allowance for doubtful accounts during the three month periods ended March 31, 2021 and 2020:

(In thousands)
Three Months Ended March 31, 2021
  
Allowance for
Doubtful Accounts
  
Balance at December 31, 2020
  
$
3,891
  
Provision for expected credit losses
    
156
  
Accounts written off
    
(353
)
Translation and other activity
    
(80
)
Balance at March 31, 2021
  
$
3,614
  

(In thousands)
Three Months Ended March 31, 2020
  
Allowance for
Doubtful Accounts
  
Balance at December 31, 2019
  
$
6,913
  
Adoption of ASU 2016-13
    
853
  
Provision for expected credit losses
    
240
  
Accounts written off
    
(336
)
Translation and other activity
    
(643
)
Balance at March 31, 2020
  
$
7,027