(6) Intangible Assets

Intangible Assets Not Subject to Amortization

The sale of Evite, as discussed in note 1 of the accompanying condensed consolidated financial statements, resulted in a reduction to Goodwill of $25.6 million and a reduction in Other intangible assets not subject to amortization related to tradenames of $4.0 million.

Intangible Assets Subject to Amortization

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Amortization expense for intangible assets with finite useful lives was $13.9 million and $15.2 million for the three months ended September 30, 2020 and 2019, respectively. Amortization expense for intangible assets with finite useful lives was $41.9 million and $46.5 million for the nine months ended September 30, 2020 and 2019, respectively. Amortization expense for amortizable intangible assets for each of the five succeeding fiscal years is estimated to be (amounts in thousands):

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