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Credit Losses (Tables)
9 Months Ended
Sep. 30, 2021
Credit Loss [Abstract]  
Accounts receivable, allowance for credit loss The following table summarizes the changes in allowance for credit losses on our accounts receivables, certain non-trade accounts receivable and contract assets for the nine months ended September 30, 2021 and 2020 (in thousands):
For the Nine Months Ended September 30,
20212020
Balance as of beginning of period$(7,056)$(41)
Passport acquisition— (2,582)
Cumulative transition adjustment— (2,815)
Provision for credit losses(1,949)(1,438)
Charge-offs(1)
5,076 1,665 
Balance as of end of period$(3,929)$(5,211)
(1)Charge offs for the nine months ended September 30, 2021, are due to balances written-off that were previously fully reserved as part of the Passport transaction.