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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | [1] | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | [1] | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contract revenues | $ 373,501 | $ 373,502 | $ 356,185 | $ 300,129 | $ 343,660 | $ 283,259 | $ 261,934 | $ 253,634 | $ 1,403,317 | $ 1,142,487 | $ 1,061,681
Income from operations |  |  |  |  |  |  |  |  | 29,558 | 38,754 | 44,841
T&D [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contract revenues |  |  |  |  |  |  |  |  | 879,372 | 818,972 | 794,898
Income from operations |  |  |  |  |  |  |  |  | 39,631 | 63,459 | 63,155
C&I [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contract revenues |  |  |  |  |  |  |  |  | 523,945 | 323,515 | 266,783
Income from operations |  |  |  |  |  |  |  |  | 25,048 | 13,920 | 13,592
General Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | $ (35,121) | $ (38,625) | $ (31,906)
[1] | Results for the fourth quarter of 2017 include a net Tax Act benefit of $7.8 million, or $0.48 and $0.47 per basic and diluted share, respectively. See further discussion in Note 10 — Income Taxes to our Financial Statements.

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