pre_text: Note 26. Other Income (Expense) Other income (expense), net consisted of the following (in thousands):
table: Years Ended December 31,
table: 2019 2018 2017
table: Foreign currency transaction gains(losses) $(1,262) $2,029 $(548)
table: Gains (losses) on derivative instruments not designated as hedges (674) (1,751) 143
table: Net investment gains (losses) on investments held in rabbi trust 2,379 (867) 1,619
table: Other miscellaneous income (expense) (857) (1,659) 44
table: $(414) $(2,248) $1,258
question: Analyse this data from a financial earnings document. What was the overall change in Net investment gains  on investments held in rabbi trust in 2019 from 2017?