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Segments (Notes)
9 Months Ended
Sep. 30, 2021
Segments [Abstract]  
Segment Reporting Disclosure Segments    We operate our business as two reportable segments: the Renewables segment and the Specialty Civil segment. Each of our reportable segments is comprised of similar business units that specialize in services unique to their respective markets. The classification of revenue and gross profit for segment reporting purposes can at times require judgment on the part of
management. Our segments may perform services across industries or perform joint services for customers in multiple industries. To determine reportable segment gross profit, certain allocations, including allocations of shared and indirect costs, such as facility costs, equipment costs and indirect operating expenses, were made based on segment revenue.

    Separate measures of the Company’s assets, including capital expenditures and cash flows by reportable segment are not produced or utilized by management to evaluate segment performance. A substantial portion of the Company’s fixed assets are owned by and accounted for in our equipment department, including operating machinery, equipment and vehicles, as well as office equipment, buildings and leasehold improvements, and are used on an interchangeable basis across our reportable segments. As such, for reporting purposes, total under/over absorption of equipment expenses consisting primarily of depreciation is allocated to the Company's two reportable segments based on segment revenue.
    
The following is a brief description of the Company's reportable segments:

Renewables Segment

    The Renewables segment operates throughout the United States and specializes in a range of services for the power delivery, solar, wind and battery storage markets that includes design, procurement, construction, restoration, and maintenance.

Specialty Civil Segment

    The Specialty Civil segment operates throughout the United States and specializes in a range of services that include:

Heavy civil construction services such as road and bridge construction, specialty paving, sports field development, industrial maintenance, outsourced contract mining and heavy hauling.

Environmental remediation services such as site development, environmental site closure, and coal ash management.
Rail infrastructure services such as planning, design, procurement, construction and maintenance of major railway and intermodal facilities.
Segment Revenue

    Revenue by segment was as follows:
Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2021202020212020
SegmentRevenue% of Total RevenueRevenue% of Total RevenueRevenue% of Total RevenueRevenue% of Total Revenue
Renewables$517,172 74.1 %$327,051 62.6 %$1,122,400 73.2 %$900,059 66.1 %
Specialty Civil180,587 25.9 %195,181 37.4 %411,919 26.8 %460,940 33.9 %
  Total revenue$697,759 100.0 %$522,232 100.0 %$1,534,319 100.0 %$1,360,999 100.0 %

Segment Gross Profit

    Gross profit by segment was as follows:
Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2021202020212020
SegmentGross ProfitGross Profit MarginGross ProfitGross Profit MarginGross ProfitGross Profit MarginGross ProfitGross Profit Margin
Renewables$51,867 10.0 %$37,371 11.4 %$106,930 9.5 %$100,183 11.1 %
Specialty Civil20,303 11.2 %21,518 11.0 %35,264 8.6 %45,988 10.0 %
  Total gross profit$72,170 10.3 %$58,889 11.3 %$142,194 9.3 %$146,171 10.7 %