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Contract Assets and Liabilities - Summary of contract liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Contractors [Line Items]
Deferred revenue	$ 146,604		$ 155,570
Accrued loss provision	3,243		2,826
Contract liabilities	149,847		$ 158,396
Contract liabilities, Change	(8,515)	$ 20,161
Change
Contractors [Line Items]
Deferred revenue, Change	(8,966)
Accrued loss provision, Change	417
Contract liabilities, Change	$ (8,549)

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Cumulative provision for contract losses not offset against related costs accumulated on the balance sheet.

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