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Business Segments (Reconciliation of Segment Results to Consolidated Income Before Income Taxes) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Business Segments [Abstract] |  |  |  |
Income from construction operations | $ 34,045 | $ 48,829 | $ 71,062 | $ 88,951
Other income, net | 40,990 | 2,485 | 41,406 | 3,166
Interest expense | (22,519) | (15,534) | (38,083) | (29,614)
INCOME BEFORE INCOME TAXES | $ 52,516 | $ 35,780 | $ 74,385 | $ 62,503

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