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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Supplemental Cash Flow Elements [Abstract] |  |
Accounts receivable | $ (41,259) | $ (24,153)
Contracts in progress, net | 26,694 | 30,278
Receivables from and equity in construction joint ventures | (5,003) | (4,606)
Other current and non-current assets | (6,630) | (1,314)
Accounts payable | 47,423 | (10,257)
Accrued compensation and other liabilities | 12,916 | 18,391
Members' interest subject to mandatory redemption and undistributed earnings | 1,013 | 1,795
Changes in operating assets and liabilities | $ 35,154 | $ 10,134

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