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WARRANTIES | 12 Months Ended
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Dec. 31, 2020
WARRANTIES |
WARRANTIES | NOTE 15. WARRANTIES Provisions of our sales agreements include customary product warranties, ranging from 12 months to 24 months after shipment. The estimated cost of our warranty obligation is recorded when revenue is recognized and is based upon our historical experience by product, and configuration. Our estimated warranty obligation is included in Other accrued expenses in our Consolidated Balance Sheets. Changes in our product warranty obligation are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2020 |  | 2019 |  | 2018
Balances at beginning of period | ​ | $ | 6,413 | ​ | $ | 2,084 | ​ | $ | 2,312
Warranty acquired in business combinations | ​ |  | 15 | ​ |  | 4,818 | ​ |  | 305
Increases to accruals | ​ |  | 2,996 | ​ |  | 1,752 | ​ |  | 1,606
Warranty expenditures | ​ |  | (4,688) | ​ |  | (2,249) | ​ |  | (2,127)
Effect of changes in exchange rates | ​ |  | 44 | ​ |  | 8 | ​ |  | (12)
Balances at end of period | ​ | $ | 4,780 | ​ | $ | 6,413 | ​ | $ | 2,084
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- Definition The entire disclosure for standard and extended product warranties and other product guarantee contracts, including a tabular reconciliation of the changes in the guarantor's aggregate product warranty liability for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -URI http://asc.fasb.org/topic&trid=2155896 + Details
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