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Goodwill and Intangible Assets | 3 Months Ended
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Mar. 31, 2020
Goodwill and Intangible Assets |
Goodwill and Intangible Assets | Note 6—Goodwill and Intangible Assets ​ The carrying amount of goodwill by reportable segment is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31, |
Reporting Segment |  | 2020 |  | 2019 |
Power |  | $ | 26,194 | ​ | $ | 26,194 | ​
Pipeline |  |  | 52,415 | ​ |  | 52,415 | ​
Utilities |  |  | 37,312 | ​ |  | 37,312 | ​
Transmission | ​ | ​ | 59,032 | ​ | ​ | 59,032 | ​
Civil |  |  | 40,150 | ​ |  | 40,150 | ​
Total Goodwill | ​ | $ | 215,103 | ​ | $ | 215,103 | ​
​ The table below summarizes the intangible asset categories, amounts and the average amortization periods, which are on a straight-line basis (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | March 31, 2020 | ​ | December 31, 2019 | ​
​ |  | Weighted Average Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Intangible assets, net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Intangible assets, net |
Tradename | ​ | 9 years | ​ | $ | 16,040 | ​ | ​ | (13,714) | ​ | ​ | 2,326 | ​ | $ | 16,040 | ​ | $ | (13,216) | ​ | $ | 2,824 | ​
Customer relationships |  | 17 years | ​ |  | 91,000 | ​ | ​ | (26,128) | ​ | ​ | 64,872 | ​ |  | 91,000 | ​ |  | (24,353) | ​ |  | 66,647 | ​
Non-compete agreements | ​ | 5 years | ​ |  | 1,900 | ​ | ​ | (1,653) | ​ | ​ | 247 | ​ |  | 1,900 | ​ |  | (1,580) | ​ |  | 320 | ​
Other | ​ | 3 years | ​ | ​ | 275 | ​ | ​ | (260) | ​ | ​ | 15 | ​ | ​ | 275 | ​ | ​ | (237) | ​ | ​ | 38 | ​
Total |  | 16 years | ​ | $ | 109,215 | ​ | $ | (41,755) | ​ | $ | 67,460 | ​ | $ | 109,215 | ​ | $ | (39,386) | ​ | $ | 69,829 | ​
​ Amortization expense of intangible assets was $2.4 million and $2.7 million for the three months ended March 31, 2020 and 2019, respectively. Estimated future amortization expense for intangible assets is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​
​ | ​ | Estimated |
​ | ​ | Intangible |
​ | ​ | Amortization |
For the Years Ending December 31, |  | Expense |
2020 (remaining nine months) | ​ | $ | 6,448 | ​
2021 | ​ | ​ | 7,577 | ​
2022 | ​ |  | 6,416 | ​
2023 | ​ |  | 5,581 | ​
2024 | ​ |  | 4,862 | ​
Thereafter | ​ |  | 36,576 | ​
​ | ​ | $ | 67,460 | ​
​

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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