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Accounts Receivable and Allowance for Expected Credit Losses - Accounts Receivable, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Accounts receivable:    
Billed receivables $ 636,288 $ 542,056
Unbilled receivables 352,711 248,681
Allowance for expected credit losses (41,006) (36,617)
Accounts receivable, net $ 947,993 $ 754,120