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Business Segments (Reconciliation of Segment Results to Consolidated Income Before Income Taxes) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Segments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income from construction operations | $ 59,343 | $ 49,072 | $ 34,045 | $ 37,017 | $ 52,050 | $ 60,919 | $ 48,829 | $ 40,122 | $ 179,477 | $ 201,920 | $ 105,413
Other income, net |  |  |  |  |  |  |  |  | 43,882 | 6,977 | 13,569
Interest expense |  |  |  |  |  |  |  |  | (69,384) | (59,782) | (45,143)
INCOME BEFORE INCOME TAXES | $ 45,193 | $ 34,396 | $ 52,516 | $ 21,870 | $ 38,685 | $ 47,926 | $ 35,780 | $ 26,724 | $ 153,975 | $ 149,115 | $ 73,839

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