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Revenue from Contracts with Customers - Schedule of Contract with Customer, Asset and Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Contract assets	$ 171,956	$ 177,830	$ 158,243
Contract assets, non-current	0	0
Contract liabilities	(722,252)	(623,642)	$ (552,290)
Contract liabilities, non-current	(2,283)	(2,142)
Net contract liabilities	$ (552,579)	$ (447,954)

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Net contract assets and liabilities.

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- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
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