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Subsequent Events (Details) - USD ($) $ in Thousands	3 Months Ended
Subsequent Events (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Income from construction operations	$ (925)	$ 37,017
Civil [Member]
Income from construction operations	2,839	$ 31,888
Scenario Unfavorable Adjustment [Member] \| Civil [Member]
Income from construction operations	$ 17,800