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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill |  |  |  |
Goodwill, Beginning Balance |  | $ 153,374 | $ 127,226 |
Goodwill acquired during the year |  | 52,785 | 26,269 |
Goodwill impairment | $ (2,700) | 0 | 0 | $ (2,716)
Purchase price allocation adjustments |  |  | 121 |
Goodwill, Ending Balance |  | 206,159 | 153,374 | 127,226
Power |  |  |  |
Goodwill |  |  |  |
Goodwill, Beginning Balance |  | 24,391 | 24,512 |
Goodwill acquired during the year |  | 1,542 |  |
Purchase price allocation adjustments |  |  | 121 |
Goodwill, Ending Balance |  | 25,933 | 24,391 | 24,512
Pipeline |  |  |  |
Goodwill |  |  |  |
Goodwill, Beginning Balance |  | 51,521 | 42,252 |
Goodwill acquired during the year |  | 764 | 9,269 |
Goodwill, Ending Balance |  | 52,285 | 51,521 | 42,252
Utilities |  |  |  |
Goodwill |  |  |  |
Goodwill, Beginning Balance |  | 37,312 | 20,312 |
Goodwill acquired during the year |  |  | 17,000 |
Goodwill, Ending Balance |  | 37,312 | 37,312 | 20,312
Transmission |  |  |  |
Goodwill |  |  |  |
Goodwill acquired during the year |  | 50,479 |  |
Goodwill, Ending Balance |  | 50,479 |  |
Civil |  |  |  |
Goodwill |  |  |  |
Goodwill, Beginning Balance |  | 40,150 | 40,150 |
Goodwill, Ending Balance |  | $ 40,150 | $ 40,150 | $ 40,150

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