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Contract Assets and Liabilities - Summary of assets and liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Contractors [Line Items]
Contract assets, net	$ 223,718		$ 217,109
Contract liabilities	(100,635)		(105,486)
Net contract assets (liabilities)	123,083		$ 111,623
Changes in contract assets, net	7,467	$ 27,615
Net Period Change [Member]
Contractors [Line Items]
Changes in contract assets, net	6,609
Changes in contract liabilities	4,851
Changes in net contract assets (liabilities)	$ 11,460

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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