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Segment Information - Revenue, Operating Income, and Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Total Revenue	$ 264,086	$ 268,734	$ 488,035	$ 491,226
Operating income	11,184	12,149	15,904	18,828
Heavy Civil Construction
Segment Reporting Information [Line Items]
Total Revenue	228,130	223,283	409,314	410,524
Operating income	6,146	6,395	5,299	8,340
Residential Construction
Segment Reporting Information [Line Items]
Total Revenue	35,956	45,451	78,721	80,702
Operating income	$ 5,038	$ 5,754	$ 10,605	$ 10,488

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The net result for the period of deducting operating expenses from operating revenues.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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