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Revenue From Contracts With Customers - By Contract Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total Revenue	$ 291,699	$ 291,266	$ 779,734	$ 782,492
Heavy Civil Construction
Disaggregation of Revenue [Line Items]
Total Revenue	251,757	254,544	661,071	665,068
Heavy Civil Construction | Fixed Unit Price
Disaggregation of Revenue [Line Items]
Total Revenue	207,807	208,070	534,323	562,791
Heavy Civil Construction | Lump Sum and Other
Disaggregation of Revenue [Line Items]
Total Revenue	$ 43,950	$ 46,474	$ 126,748	$ 102,277

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+ References

No definition available.

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- Definition

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)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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