Interim Financial Statements (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Unbilled receivables	$ 264,500		$ 146,800
Contract liabilities	109,600		51,600
Deferred revenue and customer advances	61,641		$ 30,269
Revenue recognized	$ 24,000	$ 12,500