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Contract Assets and Liabilities - Summary of contract liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Contractors [Line Items]
Deferred revenue	$ 138,180		$ 155,570
Accrued loss provision	2,134		2,826
Contract liabilities	140,314		$ 158,396
Contract liabilities, Change	(18,087)	$ (4,697)
Change
Contractors [Line Items]
Deferred revenue, Change	(17,390)
Accrued loss provision, Change	(692)
Contract liabilities, Change	$ (18,082)

X

- Definition

Its represent the contract with customer, liability excluding provision for loss on contracts, current.

+ References

No definition available.

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- Definition

n/a

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- Definition

The increase (decrease) during the reporting period of the amount of accrued loss provision.

+ References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

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-Publisher FASB
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- Definition

Amount of increase (decrease) in deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

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- Definition

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

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