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Contract Assets and Liabilities - Summary of contract liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Contractors [Line Items]
Deferred revenue	$ 162,584		$ 165,699
Accrued loss provision	2,543		2,232
Contract liabilities	165,127		$ 167,931
Contract liabilities, Change	(4,470)	$ (18,087)
Change
Contractors [Line Items]
Deferred revenue, Change	(3,115)
Accrued loss provision, Change	311
Contract liabilities, Change	$ (2,804)

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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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