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ALLOWANCE FOR CREDIT LOSSES
 9 Months Ended
Sep. 30, 2021
Credit Loss [Abstract]  
ALLOWANCE FOR CREDIT LOSSES ALLOWANCE FOR CREDIT LOSSES
Our allowance for credit losses is computed using a number of factors including our past credit loss experience, the aging of amounts due from our customers, and our customers' credit ratings, in addition to other customer specific factors. We have also assessed the current macroeconomic environment, including the impact of the COVID-19 pandemic, to determine our ending allowance for credit losses for both accounts receivable and contract assets. The allowance for credit losses on contract assets was not significant.
A rollforward of our allowance for credit losses on our accounts receivable balance is presented below for the nine months ended September 30, 2021:
Balance, December 31, 2020$38,113 
Provision2,885 
Write-offs(3,884)
Balance, September 30, 2021$37,114 
Recoveries of amounts previously written off were not significant for the three and nine months ended September 30, 2021.