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Reportable Segments (Tables) | 12 Months Ended
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Dec. 31, 2018
Reportable Segments |
Schedule of revenue by segment | Revenue by segment for the years ended December 31, 2018, 2017 and 2016 was as follows (in thousands):
|  | 2018 |  | 2017 |  | 2016 |
|  |  |  |  | % of |  |  |  |  | % of |  |  |  |  | % of |
|  |  |  |  | Total |  |  |  |  | Total |  |  |  |  | Total |
Segment |  | Revenue |  | Revenue |  | Revenue |  | Revenue |  | Revenue |  | Revenue |
Power |  | $ | 694,048 |  | 23.6% |  | $ | 606,125 |  | 25.5% |  | $ | 478,653 |  | 24.0% |
Pipeline |  |  | 590,937 |  | 20.1% |  |  | 465,570 |  | 19.5% |  |  | 401,931 |  | 20.1% |
Utilities |  |  | 902,772 |  | 30.7% |  |  | 806,523 |  | 33.9% |  |  | 637,212 |  | 31.9% |
Transmission (1) |  |  | 286,749 |  | 9.8% |  |  | — |  | — |  |  | — |  | — |
Civil |  |  | 464,972 |  | 15.8% |  |  | 501,777 |  | 21.1% |  |  | 479,152 |  | 24.0% |
Total |  | $ | 2,939,478 |  | 100.0% |  | $ | 2,379,995 |  | 100.0% |  | $ | 1,996,948 |  | 100.0% |
| (1) |  | Represents results from the June 1, 2018 acquisition date of Willbros to December 31, 2018.
Schedule of gross profit by segment | Gross profit by segment for the years ended December 31, 2018, 2017 and 2016 was as follows (in thousands):
|  | 2018 |  | 2017 |  | 2016 |
|  |  |  |  | % of |  |  |  |  | % of |  |  |  |  | % of |
|  |  |  |  | Segment |  |  |  |  | Segment |  |  |  |  |  |
Segment |  | Gross Profit |  | Revenue |  | Gross Profit |  | Revenue |  | Gross Profit |  | Revenue |
Power |  | $ | 109,789 |  | 15.8% |  | $ | 65,675 |  | 10.8% |  | $ | 49,807 |  | 10.4% |
Pipeline |  |  | 66,602 |  | 11.3% |  |  | 92,087 |  | 19.8% |  |  | 68,100 |  | 16.9% |
Utilities |  |  | 111,825 |  | 12.4% |  |  | 113,037 |  | 14.0% |  |  | 100,071 |  | 15.7% |
Transmission (1) |  |  | 31,904 |  | 11.1% |  |  | — |  | — |  |  | — |  | — |
Civil |  |  | 5,617 |  | 1.2% |  |  | 7,635 |  | 1.5% |  |  | (16,671) |  | (3.5%) |
Total |  | $ | 325,737 |  | 11.1% |  | $ | 278,434 |  | 11.7% |  | $ | 201,307 |  | 10.1% |
| (1) |  | Represents results from the June 1, 2018 acquisition date of Willbros to December 31, 2018.

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