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Warranties | 9 Months Ended
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Sep. 30, 2021
Guarantees [Abstract] |
Warranties | Warranties The Company has product warranties with various terms ranging from one year from the date of first use or 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:
| Three Months Ended |  | Nine Months Ended
| September 30, 2021 |  | September 30, 2020 |  | September 30, 2021 |  | September 30, 2020
Warranty accrual: | (in thousands)
Balance, beginning of period | $ | 14,008 |  |  | $ | 13,160 |  |  | $ | 13,522 |  |  | $ | 12,652 |
Payments made | (1,825) |  |  | (1,687) |  |  | (4,834) |  |  | (4,481) |
Provisions | 1,272 |  |  | 2,054 |  |  | 4,767 |  |  | 5,356 |
Balance, end of period | $ | 13,455 |  |  | $ | 13,527 |  |  | $ | 13,455 |  |  | $ | 13,527 |
Warranty expense: | $ | 1,272 |  |  | $ | 2,054 |  |  | $ | 4,767 |  |  | $ | 5,356 |

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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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