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Construction Joint Ventures - Income Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]
Revenues	$ 222,492	$ 153,416
Revenues	1,191	371
Joint Ventures
Schedule of Equity Method Investments [Line Items]
Revenues	31,357	14,609
Income before tax	3,404	1,173
Revenues	15,065	6,488
Income before tax	$ 1,691	$ 553

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- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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