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Contract Assets and Liabilities - Summary of contract assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Contractors [Line Items]
Unbilled revenue	$ 126,087	$ 111,153
Contract retainages, net	91,022	49,128
Contract assets	217,109	160,281
Changes in contract assets	16,443	$ 28,141	$ 17,857
Net Period Change [Member]
Contractors [Line Items]
Changes in unbilled revenue	14,934
Changes in contract retainages, net	41,894
Changes in contract assets	$ 56,828

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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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