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Construction Joint Ventures - Construction Joint Ventures, Partner Share (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Current assets	$ 361,543	$ 330,270
Current liabilities	(321,884)	(266,253)
Receivables from and equity in construction joint ventures	16,653	9,196
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Receivables from and equity in construction joint ventures	16,653
Joint Ventures | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Current assets	143,608	92,710
Current liabilities	$ (141,295)	(86,705)
Receivables from and equity in construction joint ventures		$ 9,196

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