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Reportable Segments (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($)
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  |  | 3 |
Revenue | $ 579,017 | $ 608,311 | $ 631,165 | $ 561,502 | $ 601,863 | $ 507,828 | $ 456,811 | $ 430,446 | $ 2,379,995 | $ 1,996,948 | $ 1,929,415
% of Total Revenue |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Gross Profit | $ 68,477 | $ 70,421 | $ 84,483 | $ 55,053 | $ 68,616 | $ 50,129 | $ 43,285 | $ 39,277 | $ 278,434 | $ 201,307 | $ 219,873
% of Revenue |  |  |  |  |  |  |  |  | 11.70% | 10.10% | 11.40%
Power |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 606,125 | $ 478,653 | $ 466,292
% of Total Revenue |  |  |  |  |  |  |  |  | 25.50% | 24.00% | 24.20%
Gross Profit |  |  |  |  |  |  |  |  | $ 65,675 | $ 49,807 | $ 53,620
% of Revenue |  |  |  |  |  |  |  |  | 10.80% | 10.40% | 11.50%
Pipeline |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 465,570 | $ 401,931 | $ 299,365
% of Total Revenue |  |  |  |  |  |  |  |  | 19.50% | 20.10% | 15.50%
Gross Profit |  |  |  |  |  |  |  |  | $ 92,087 | $ 68,100 | $ 24,685
% of Revenue |  |  |  |  |  |  |  |  | 19.80% | 16.90% | 8.20%
Utilities |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 806,523 | $ 637,212 | $ 587,047
% of Total Revenue |  |  |  |  |  |  |  |  | 33.90% | 31.90% | 30.40%
Gross Profit |  |  |  |  |  |  |  |  | $ 113,037 | $ 100,071 | $ 96,450
% of Revenue |  |  |  |  |  |  |  |  | 14.00% | 15.70% | 16.40%
Civil |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 501,777 | $ 479,152 | $ 576,711
% of Total Revenue |  |  |  |  |  |  |  |  | 21.10% | 24.00% | 29.90%
Gross Profit |  |  |  |  |  |  |  |  | $ 7,635 | $ (16,671) | $ 45,118
% of Revenue |  |  |  |  |  |  |  |  | 1.50% | (3.50%) | 7.80%

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