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Contract Assets and Liabilities - Summary of contract assets and liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Contractors [Line Items]
Contract assets, net	$ 192,883		$ 185,803
Contract liabilities	(140,314)		(158,396)
Net contract assets (liabilities)	52,569		$ 27,407
Contract assets, net, Change	6,991	$ 7,467
Change
Contractors [Line Items]
Contract assets, net, Change	7,080
Contract liabilities, Change	18,082
Net contract assets (liabilities), Change	$ 25,162

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- Definition

The amount of increase (decrease) in net contract assets (liabilities) during the year.

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The amount of net contract assets (liabilities) as at balance sheet period.

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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

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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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Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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