pre_text: Our CODM evaluates each segment based on Adjusted Earnings Before Interest, Taxes, Depreciation and Amortization (“Adjusted EBITDA”), and we therefore consider Adjusted EBITDA to be a primary measure of operating performance of our operating segments. We define Adjusted EBITDA as earnings before investment income, interest expense, taxes, depreciation, amortization and stock-based compensation and other adjustments as identified below. The adjustments to our financial results prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) to calculate Adjusted EBITDA are itemized below (in thousands): It is not practicable for us to report identifiable assets by segment because these businesses share resources, functions and facilities We do not have significant long-lived assets outside the United States.
table: Year Ended February 28,
table: 2019 2018 2017
table: Net income (loss) $18,398 $16,617 $(7,904)
table: Investment income (5,258) (2,256) (1,691)
table: Interest expense 16,726 10,280 9,896
table: Income tax provision (benefits) (1,330) 10,681 (1,563)
table: Depreciation and amortization 20,016 22,957 23,469
table: Stock-based compensation 11,029 9,298 7,833
table: Impairment loss and equity in net loss of affiliate 6,787 1,411 1,284
table: Loss on extinguishment of debt 2,033 - -
table: Acquisition and integration related expenses 935 - 4,513
table: Non-recurring legal expenses, net of reversal of litigation
table: provision (11,020) 10,738 9,192
table: Gain on LoJack battery performance legal Settlement (18,333) (28,333) -
table: Restructuring 8,015 - -
table: Other 217 989 4,339
table: Adjusted EBITDA $48,215 $52,382 $49,368
question: Analyse this data from a financial earnings document. What was the change in interest expense between 2017 and 2018?