pre_text: ADVANCED ENERGY INDUSTRIES, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (continued) (in thousands, except per share amounts) ADVANCED ENERGY INDUSTRIES, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (continued) (in thousands, except per share amounts) The following table presents our net sales by extended warranty and service contracts recognized over time and our product and service revenue recognized at a point in time:
table: Years Ended December 31,
table: 2019 2018 2017
table: Product and service revenue recognized at point in time $786,918 $715,055 $667,440
table: Extended warranty and service contracts recognized over time 2,030 3,837 3,572
table: Total $788,948 $718,892 $671,012
question: Analyse this data from a financial earnings document. What was the change in Extended warranty and service contracts recognized over time between 2017 and 2018?