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Contract Assets and Liabilities - Summary of Contract Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Contractors [Line Items]
Deferred revenue	$ 165,699	$ 155,570
Accrued loss provision	2,232	2,826
Contract liabilities	167,931	158,396
Changes in contract liabilities	9,573	$ 52,918	$ 28,163
Net Period Change
Contractors [Line Items]
Change in deferred revenue	10,129
Change in accrued loss provision	(594)
Changes in contract liabilities	$ 9,535

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- Definition

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