Revenue from Contracts with Customers Schedule of Contract Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Billed receivables	$ 318,417	$ 312,991
Unbilled receivables	128,099	106,007
Allowance for doubtful accounts	(17,761)	(18,377)
Receivables—net	$ 428,755	$ 400,621

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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