4.  GOODWILL AND OTHER INTANGIBLES

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We have two reporting units which are also our operating and reportable segments: Installation and Specialty Distribution. Both reporting units contain goodwill. Assets acquired and liabilities assumed are assigned to the applicable reporting unit based on whether the acquired assets and liabilities relate to the operations of such unit and determination of its fair value. Goodwill assigned to the reporting unit is the excess of the fair value of the acquired business over the fair value of the individual assets acquired and liabilities assumed for the reporting unit.

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In the fourth quarter of 2024, we performed an annual assessment on our goodwill resulting in no impairment and there were no indicators of impairment for the three months ended March 31, 2025.

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Changes in the carrying amount of goodwill for the three months ended March 31, 2025, by segment, were as follows, in thousands:

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Additions during the three months ended March 31, 2025, pertain to measurement period adjustments to the fair value of goodwill assigned to businesses acquired in the last twelve months.

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Other intangible assets, net includes customer relationships, non-compete agreements, and trademarks / trade names. The following table sets forth our other intangible assets, in thousands:

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The following table sets forth our amortization expense, in thousands:

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