pre_text: Operating Expenses The following table sets forth, for the periods indicated, the amount of operating expenses and their relative percentages of total net sales by the line items reflected in our consolidated statement of operations (dollars in thousands):
table: Fiscal 2019 Fiscal 2018
table: Amount Percentage of total net sales Amount Percentage of total net sales
table: (Dollars in thousands)
table: Research and development $117,353 8.2% $132,586 7.0%
table: Selling, general and administrative 272,257 19.0% 293,632 15.4%
table: Impairment and other charges — —% 766 —%
table: Amortization of intangible assets 13,760 1.0% 10,690 0.6%
table: Total operating expenses $403,370 28.2% $437,674 23.0%
question: Analyse this data from a financial earnings document. What was the change in the amount of Amortization of intangible assets in 2019 from 2018?