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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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