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Contract Assets and Liabilities - Summary of contract assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Contractors [Line Items]
Unbilled revenue, net	$ 128,785		$ 126,087
Contract retainages, net	92,806		91,022
Contract assets, net	221,591		$ 217,109
Changes in contract assets, net, Change	4,754	$ 38,910
Change
Contractors [Line Items]
Unbilled revenue, net, Change	2,698
Contract retainages, net, Change	1,784
Changes in contract assets, net, Change	$ 4,482

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Amount of right to consideration in exchange for good or service transferred to customer withheld under retainage provision in long-term contract or program when right to consideration is unconditional.

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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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