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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Business Segments [Abstract] |  |  |  |
Income from construction operations | $ 49,072 | $ 60,919 | $ 120,134 | $ 149,870
Other income, net | 967 | 2,048 | 42,373 | 5,214
Interest expense | (15,643) | (15,041) | (53,726) | (44,655)
INCOME BEFORE INCOME TAXES | $ 34,396 | $ 47,926 | $ 108,781 | $ 110,429

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