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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total Revenue	$ 291,699	$ 291,266	$ 779,734	$ 782,492
Operating income	12,115	14,373	28,019	33,201
Acquisition related costs	(1,896)	0	(2,158)	0
Heavy Civil Construction
Segment Reporting Information [Line Items]
Total Revenue	251,757	254,544	661,071	665,068
Operating income	8,692	9,148	14,253	17,488
Residential Construction
Segment Reporting Information [Line Items]
Total Revenue	39,942	36,722	118,663	117,424
Operating income	5,319	5,225	15,924	15,713
Operating Segments
Segment Reporting Information [Line Items]
Operating income	$ 14,011	$ 14,373	$ 30,177	$ 33,201

X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
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- Definition

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+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
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- Definition

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