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Construction Joint Ventures - SEMA Financials (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |
Operating income | $ 32,720 | $ 33,046 | $ 55,475 | $ 45,149
Net income | 20,056 | 18,210 | $ 30,611 | 21,325
RLW | Joint Ventures |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage |  |  | 51.00% |
SEMA Construction Inc | Joint Ventures | Variable Interest Entity, Primary Beneficiary |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Revenues | 9,325 | 3,404 | $ 17,566 | 7,468
Operating income | 613 | 375 | 3,140 | 671
Net income | $ 615 | $ 376 | $ 3,143 | $ 675

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