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Revenue - Summary of Total Receivables, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Billed receivables	$ 142,264	$ 179,177
Allowance for doubtful accounts	(3,578)	(3,912)
Billed receivables, net	138,686	175,265
Current accrued receivables, net	150,665	167,614
Long-term accrued receivables, net	190,399	215,772
Total accrued receivables, net	341,064	383,386
Total receivables, net	$ 479,750	$ 558,651

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Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements net of the significant financing component.

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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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