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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets |
Schedule of goodwill by reporting unit | The change in goodwill by segment for 2017 and 2016 was as follows (in thousands):
|  | Power |  | Pipeline |  | Utilities |  | Civil |  | Total |
Balance at January 1, 2016 |  | $ | 20,731 |  | $ | 42,252 |  | $ | 18,312 |  | $ | 42,866 |  | $ | 124,161 |
Goodwill acquired during the year |  |  | 3,781 |  |  | — |  |  | 2,000 |  |  | — |  |  | 5,781 |
Goodwill impairment |  |  | — |  |  | — |  |  | — |  |  | (2,716) |  |  | (2,716) |
Balance at December 31, 2016 |  | $ | 24,512 |  | $ | 42,252 |  | $ | 20,312 |  | $ | 40,150 |  | $ | 127,226 |
Goodwill acquired during the year |  |  | — |  |  | 9,269 |  |  | 17,000 |  |  | — |  |  | 26,269 |
Purchase price allocation adjustments |  |  | (121) |  |  | — |  |  | — |  |  | — |  |  | (121) |
Balance at December 31, 2017 |  | $ | 24,391 |  | $ | 51,521 |  | $ | 37,312 |  | $ | 40,150 |  | $ | 153,374 |
Summary of intangible asset categories, amounts and the average amortization periods | The table below summarizes the intangible asset categories, amounts and the average amortization periods, which are generally on a straight-line basis, at December 31 (in thousands):
|  |  |  | December 31, 2017 |  | December 31, 2016 |
|  | Weighted Average Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization |
Tradename |  | 9 years |  | $ | 32,175 |  | $ | (22,238) |  | $ | 30,485 |  | $ | (18,733) |
Customer relationships |  | 10 years |  |  | 49,900 |  |  | (16,338) |  |  | 33,579 |  |  | (13,439) |
Non-compete agreements |  | 5 years |  |  | 1,900 |  |  | (820) |  |  | 2,250 |  |  | (1,301) |
Other |  | 3 years |  |  | 275 |  |  | (54) |  |  | — |  |  | — |
|  |  |  | $ | 84,250 |  | $ | (39,450) |  | $ | 66,314 |  | $ | (33,473) |
Schedule of estimated future amortization expense for intangible assets | In the second quarter of 2017, we recorded a $0.5 million impairment charge related to our tradename intangible assets. Estimated future amortization expense for intangible assets as of December 31, 2017 is as follows (in thousands):
|  | Estimated |
|  | Intangible |
For the Years Ending |  | Amortization |
December 31, |  | Expense |
2018 |  | $ | 9,541 |
2019 |  |  | 9,193 |
2020 |  |  | 6,442 |
2021 |  |  | 5,203 |
2022 |  |  | 4,048 |
Thereafter |  |  | 10,373 |
|  | $ | 44,800 |

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