Note 8. Other Intangible Assets, Net

Other intangible assets consisted of the following:

Amortization expenses

Amortization expense relating to intangible assets for the years ended December 31, 2020, 2019 and 2018, was approximately $24.3 million, $25.2 million and $32.4 million, respectively. The decrease in amortization expense in 2020 and 2019 was primarily due to change in the estimated useful lives of certain intangibles assets as of December 31, 2018.

As of December 31, 2020, estimated future amortization expense relating to definite life intangible assets for each of the next five years and thereafter were as follows:

During the years ended December 31, 2020 and 2018, the Company recorded impairment charges of $5.3 million and $2.2 million, respectively, related to its definite life intangible assets. No impairment charges were recorded during 2019.