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Goodwill | 3 Months Ended
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Mar. 31, 2020
Goodwill |
Goodwill | 5. Goodwill ​ Goodwill ​ The changes in the carrying amount of goodwill are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Mechanical Services | ​ | Electrical Services | ​ | ​
​ |  | Segment |  | Segment | ​ | Total
Balance at December 31, 2018 | ​ | $ | 235,182 | ​ | $ | — | ​ | $ | 235,182
Acquisitions and purchase price adjustments (See Note 4) | ​ |  | 579 | ​ |  | 96,686 | ​ | ​ | 97,265
Impact of segment reorganization | ​ | ​ | (1,101) | ​ | ​ | 1,101 | ​ | ​ | —
Balance at December 31, 2019 | ​ | ​ | 234,660 | ​ | ​ | 97,787 | ​ | ​ | 332,447
Acquisitions and purchase price adjustments (See Note 4) | ​ | ​ | — | ​ | ​ | 14,944 | ​ | ​ | 14,944
Balance at March 31, 2020 | ​ | $ | 234,660 | ​ | $ | 112,731 | ​ | $ | 347,391
​ During the fourth quarter of 2019, the Company performed its annual goodwill impairment test resulting in no impairment charges, as the calculated fair values for the majority of the Company’s reporting units that have goodwill were significantly in excess (all greater than 80%) of the respective reporting unit’s carrying value, while two reporting units that were recently acquired had calculated fair values in excess of carrying value of at least 27%. During the first quarter of 2020, we considered the economic impacts of COVID-19 to be a triggering event for review of goodwill impairment at each of our reporting units. After performing a qualitative goodwill impairment assessment as of March 31, 2020, we determined that we did not have a goodwill impairment as of that date. However, one reporting unit’s (Walker) fair value exceeded carrying value by approximately 21%, a reduction from the excess of 27% from our 2019 annual impairment test. Walker’s forecast for the current year is lower than previously estimated, primarily due to the impact of COVID-19 on its business. As a result, this reporting unit is more susceptible to impairment risk from additional adverse changes in its operating environment including micro and macroeconomic environment conditions that could negatively impact them. Such adverse changes could include worsening economic conditions in the locations or markets they primarily serve whether due to COVID-19 or other events and conditions. As of March 31, 2020, Walker had a goodwill balance of $96.8 million.

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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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