Table:
|  |  | Fiscal Years Ended March 31, |  |
| --- | --- | --- | --- |
|  | 2019 | 2018 | 2017 |
| Operating income (GAAP) (1) | $200,849 | $112,852 | $34,968 |
| Non-GAAP adjustments: |  |  |  |
| (Gain) loss on write down and disposal of long-lived assets | 1,660 | (992) | 10,671 |
| ERP integration costs/IT transition costs | 8,813 | 80 | 7,045 |
| Stock-based compensation | 12,866 | 7,657 | 4,720 |
| Restructuring charges (2) | 8,779 | 14,843 | 5,404 |
| Legal expenses related to antitrust class actions | 5,195 | 6,736 | 2,640 |
| TOKIN investment-related expenses | — | — | 1,101 |
| Plant start-up costs (2) | (927) | 929 | 427 |
| Adjusted operating income (non-GAAP) (1) | $237,235 | $142,105 | $66,976 |
Paragraphs:
The following table provides reconciliation from U.S. GAAP Operating income to non-GAAP Adjusted operating income (amounts in thousands):
(1) Fiscal years ending March 31, 2018 and 2017 adjusted due to the adoption of ASC 606.
(2) $0.9 million in costs incurred during fiscal year 2018 related to the relocation of the Company's tantalum powder facility equipment from Carson City, Nevada to its existing Matamoros, Mexico plant were reclassified from “Plant start-up costs” to “Restructuring charges” during fiscal year 2019.
Question:
What was the change in the Stock-based compensation between 2017 and 2019?
Answer: 12866-4720 = 8146