Note 8. Other Intangible Assets, Net

Other intangible assets consisted of the following:

Amortization expense

Amortization expense relating to intangible assets for the years ended December 31, 2018, 2017 and 2016, was approximately $32.4 million, $35.0 million and $59.0 million, respectively. The decrease in amortization expense in 2017 was primarily due to change in the estimated useful lives of certain intangibles assets, which reduced the Company's amortization expense by $20.5 million and resulted in a decrease of $18.3 million in the Company's net loss and a decrease of $0.35 in the Company's basic and diluted loss per share.

The decrease in the Company's other intangible assets carrying amount, net of impairment and the corresponding accumulated amortization, as of December 31, 2018 resulted from Solidscape divestment, which is described in Note 2.

As of December 31, 2018, estimated future amortization expense relating to definite life intangible assets for each of the next five years and thereafter were as follows:

During 2018, 2017 and 2016, the Company recorded impairment charges of $2.2 million, $2.2 million and $17.9 million, respectively, related to certain of its intangible assets.