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Contract Assets and Liabilities - Summary of contract assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Contractors [Line Items]
Unbilled revenue, net	$ 128,015		$ 126,087
Contract retainages, net	95,703		91,022
Contract assets, net	223,718		$ 217,109
Changes in contract assets, net	7,467	$ 27,615
Net Period Change [Member]
Contractors [Line Items]
Changes in unbilled revenue, net	1,928
Changes in contract retainages, net	4,681
Changes in contract assets, net	$ 6,609

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The increase (decrease) during the reporting period of the amount of contract receivable retainage.

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Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract.

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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.

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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