Table:
|  | Years Ended December 31, |  |
| --- | --- | --- |
|  | 2019 | 2018 |
| Interest expense | $(2,648) | $(2,085) |
| Interest income | 1,737 | 1,826 |
| Other (expense) income | (2,638) | (2,676) |
| Total other (expense) income, net | $(3,549) | $(2,935) |
Paragraphs:
Results of Operations: Year Ended December 31, 2019, versus Year Ended December 31, 2018 (Amounts in thousands, except percentages and per share amounts):
Other income and expense items are summarized in the following table:
Interest expense increased mainly as a result of an increase in debt related to the QTI acquisition. Other expense in 2019 was principally driven by foreign currency translation losses, mainly due to the appreciation of the U.S. Dollar compared to the Chinese Renminbi and Euro, as well as an increase in pension expense.
Question:
What was Other expense in 2019 principally driven by?
Answer: foreign currency translation losses, mainly due to the appreciation of the U.S. Dollar compared to the Chinese Renminbi and Euro, as well as an increase in pension expense.