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Warranties | 12 Months Ended
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Dec. 31, 2019
Guarantees [Abstract] |
Warranties | Warranties The Company has warranties with various terms from 18 months for parts to 25 years for certain heat exchangers. The Company has an obligation to replace parts if conditions under the warranty are met. A provision is made for estimated warranty costs at the time the related products are sold based upon the warranty period, historical trends, new products and any known identifiable warranty issues. Changes in the warranty accrual are as follows:
| Years Ended December 31, |  |  |  |
| 2019 |  | 2018 |  | 2017
Warranty accrual: | (in thousands) |  |  |  |
Balance, beginning of period | $ | 11,421 |  |  | $ | 10,483 |  |  | $ | 7,936 |
Payments made | (6,816) |  |  | (7,869) |  |  | (8,686) |
Provisions | 8,047 |  |  | 9,669 |  |  | 11,233 |
Change in estimate | — |  |  | (862) |  |  | — |
Balance, end of period | $ | 12,652 |  |  | $ | 11,421 |  |  | $ | 10,483 |
Warranty expense: | $ | 8,047 |  |  | $ | 8,807 |  |  | $ | 11,233 |
The change in estimate relates to the Company’s failure rate calculation. During 2018, in reviewing claims data, the Company noted specific claims that were the result of an isolated incident and not representative of the Company’s historical performance or representative of expected future claims. As such, these claims were accounted for as a specific accrual for warranty liability and excluded from our failure rate that the Company utilizes in estimating future claims.

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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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