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Accounts receivable, net (Tables)
 9 Months Ended
Sep. 30, 2020
Receivables [Abstract]  
Schedule of allowance for doubtful accounts
The following table presents changes in the allowance for doubtful accounts for the nine months ended September 30, 2020:
In thousands
 
Beginning balance
$
19,923

     Current period provision
23,075

     Write-offs charged against the allowance
(21,139
)
     Recoveries of amounts previously written-off
2,230

     Disposition
(351
)
     Foreign currency
11

Ending balance
$
23,749