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Accounts Receivable (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Receivables [Abstract]    
Accounts Receivable, Allowance for Credit Loss Roll Forward The activity in our accounts receivable allowance consists of the following for the nine months ended September 30, 2021 and year ended December 31, 2020, respectively:
September 30,December 31,
20212020
Balance at beginning of year$8,745 $16,511 
Additional provisions6,532 4,339 
Write-offs(6,405)(22,205)
Opening balance sheet adjustment related to ASU 2016 -13 adoption— 10,097 
Exchange differences(230)3 
Balance at the end of year$8,642 $8,745 
  
Accounts Receivable, Allowance for Credit Loss, Current $ 8,745 $ 16,511
Additional provisions 6,532 4,339
Write-offs 6,405 22,205
Opening balance sheet adjustment related to ASU 2016 -13 adoption 0 10,097
Exchange differences (230) 3
Accounts Receivable, Allowance for Credit Loss, Current $ 8,642 $ 8,745