Accounts Receivable and Allowance for Expected Credit Losses - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accounts receivable:
Billed receivables	$ 616,761	$ 542,056
Unbilled receivables	328,836	248,681
Allowance for expected credit losses	(40,049)	(36,617)
Accounts receivable, net	$ 905,548	$ 754,120

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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Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

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