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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Business Segments [Abstract] |  |  |  |
Income (loss) from construction operations | $ 47,306 | $ 49,072 | $ 101,196 | $ 120,134
Other income, net | 1,909 | 967 | 3,739 | 42,373
Interest expense | (16,411) | (15,643) | (47,474) | (53,726)
INCOME BEFORE INCOME TAXES | $ 32,804 | $ 34,396 | $ 57,461 | $ 108,781

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