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Construction Joint Ventures - Construction Joint Ventures, Partner Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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
Schedule of Equity Method Investments [Line Items]
Revenues	$ 253,911	$ 304,219	$ 246,412	$ 153,416	$ 168,345	$ 205,629	$ 189,582	$ 126,567	$ 957,958	$ 690,123	$ 623,595
Income before tax	$ 3,963	$ 9,170	$ 4,661	$ (1,859)	$ (5,754)	$ 3,196	$ 2,570	$ (7,336)	15,935	(7,324)
Revenues									4,200	1,826	3,216
Joint Ventures
Schedule of Equity Method Investments [Line Items]
Revenues									93,848	62,440	60,289
Income before tax									7,827	5,144	6,909
Revenues									44,948	25,537	23,778
Income before tax									$ 3,847	$ 1,980	$ 2,502

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