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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill |  |  |  |  |
Goodwill, Beginning Balance |  |  | $ 127,226 | $ 124,161 |
Goodwill acquired during the year |  |  | 26,269 | 5,781 |
Goodwill impairment | $ (2,716) |  | 0 | (2,716) | $ (401)
Purchase price allocation adjustments |  |  | (121) |  |
Goodwill, Ending Balance |  | $ 124,161 | 153,374 | 127,226 | 124,161
Power |  |  |  |  |
Goodwill |  |  |  |  |
Goodwill, Beginning Balance |  |  | 24,512 | 20,731 |
Goodwill acquired during the year |  |  |  | 3,781 |
Purchase price allocation adjustments |  |  | (121) |  |
Goodwill, Ending Balance |  | 20,731 | 24,391 | 24,512 | 20,731
Pipeline |  |  |  |  |
Goodwill |  |  |  |  |
Goodwill, Beginning Balance |  |  | 42,252 | 42,252 |
Goodwill acquired during the year |  |  | 9,269 |  |
Goodwill, Ending Balance |  | 42,252 | 51,521 | 42,252 | 42,252
Utilities |  |  |  |  |
Goodwill |  |  |  |  |
Goodwill, Beginning Balance |  |  | 20,312 | 18,312 |
Goodwill acquired during the year |  |  | 17,000 | 2,000 |
Goodwill, Ending Balance |  | 18,312 | 37,312 | 20,312 | 18,312
Civil |  |  |  |  |
Goodwill |  |  |  |  |
Goodwill, Beginning Balance |  |  | 40,150 | 42,866 |
Goodwill impairment |  |  |  | (2,716) |
Goodwill, Ending Balance |  | 42,866 | $ 40,150 | $ 40,150 | $ 42,866
Cardinal Contractors |  |  |  |  |
Goodwill |  |  |  |  |
Goodwill impairment |  | $ (400) |  |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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