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Business Segments (Reconciliation Of Segment Results To Consolidated Income Before Income Taxes) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting [Abstract] |  |  |  |
Income from construction operations | $ 52,093 | $ 83,021 | $ 170,550 | $ 187,944
Other income (expense) | (464) | (8,048) | 1,142 | (8,364)
Interest expense | (16,694) | (25,613) | (52,442) | (58,513)
Income before income taxes | $ 34,935 | $ 49,360 | $ 119,250 | $ 121,067

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