pre_text: ADVANCED ENERGY INDUSTRIES, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (continued) (in thousands, except per share amounts) NOTE 15. WARRANTIES Provisions of our sales agreements include customary product warranties, ranging from 12 months to 24 months following installation. The estimated cost of our warranty obligation is recorded when revenue is recognized and is based upon our historical experience by product, configuration and geographic region. Our estimated warranty obligation is included in Other accrued expenses in our Consolidated Balance Sheets. Changes in our product warranty obligation are as follows:
table: Years Ended December 31,
table: 2019 2018 2017
table: Balances at beginning of period $2,084 $2,312 $2,329
table: Warranty acquired in business combinations 4,818 305 118
table: Increases to accruals 1,752 1,606 2,029
table: Warranty expenditures (2,249) (2,127) (2,184)
table: Effect of changes in exchange rates 8 (12) 20
table: Balances at end of period $6,413 $2,084 $2,312
question: Analyse this data from a financial earnings document. What was the Increases to accruals between 2017 and 2018?