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Accounts Receivable and Allowance for Expected Credit Losses - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Accounts receivable:
Billed receivables	$ 598,624	$ 513,459
Unbilled receivables	287,040	236,285
Allowance for expected credit losses	(39,543)	(38,387)
Accounts receivable, net	$ 846,121	$ 711,357

X

- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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