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Construction Joint Ventures - Construction Joint Ventures - Income Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]
Revenues	$ 304,219	$ 205,629	$ 704,047	$ 521,778
Revenues			2,966	1,252
Joint Ventures
Schedule of Equity Method Investments [Line Items]
Revenues	27,703	15,520	61,210	44,074
Income before tax	(6,281)	1,925	(3,611)	3,838
Revenues	13,664	6,103	28,826	17,567
Income before tax	$ (1,629)	$ 519	$ (358)	$ 1,370

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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.

+ References

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

+ References

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

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