pre_text: Non-GAAP Results Management uses non-GAAP operating income and non-GAAP EPS to evaluate business performance without the impacts of certain non-cash charges and other charges which are not part of our usual operations. We use these non- GAAP measures to assess performance against business objectives, make business decisions, including developing budgets and forecasting future periods. In addition, management’s incentive plans include these non-GAAP measures as criteria for achievements. These non-GAAP measures are not in accordance with U.S. GAAP and may differ from non- GAAP methods of accounting and reporting used by other companies. However, we believe these non-GAAP measures provide additional information that enables readers to evaluate our business from the perspective of management. The presentation of this additional information should not be considered a substitute for results prepared in accordance with U.S. GAAP. The non-GAAP results presented below exclude the impact of non-cash related charges, such as stock-based compensation and amortization of intangible assets. In addition, they exclude discontinued operations and other nonrecurring items such as acquisition-related costs and restructuring expenses, as they are not indicative of future performance. The tax effect of our non-GAAP adjustments represents the anticipated annual tax rate applied to each non-GAAP adjustment after consideration of their respective book and tax treatments and effect of adoption of the Tax Act.
table: Reconciliation of Non-GAAP measure - operating expenses and operating income from continuing operations, excluding certain items (in thousands) Years Ended December 31,
table: 2019 2018
table: Gross profit from continuing operations, as reported $ 315,652 $365,607
table: Adjustments to gross profit:
table: Stock-based compensation 525 742
table: Facility expansion and relocation costs 3,891 1,328
table: Acquisition-related costs 8,290 569
table: Non-GAAP gross profit 328,358 368,246
table: Non-GAAP gross margin 41.6% 51.2%
table: Operating expenses from continuing operations, as reported 261,264 194,054
table: Adjustments:
table: Amortization of intangible assets (12,168) (5,774)
table: Stock-based compensation (6,803) (8,961)
table: Acquisition-related costs (12,002) (1,726)
table: Facility expansion and relocation costs (948) (518)
table: Restructuring charges (5,038) (4,239)
table: Non-GAAP operating expenses 224,305 172,836
table: Non-GAAP operating income $  104,053 $  195,410
question: Analyse this data from a financial earnings document. What was the change in the Gross profit from continuing operations, as reported between 2018 and 2019?