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Warranties | 12 Months Ended
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Dec. 31, 2017
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 or service its products 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 Ending December 31,
| 2017 |  | 2016 |  | 2015
Warranty accrual: | (in thousands)
Balance, beginning of period | $ | 7,936 |  |  | $ | 8,469 |  |  | $ | 8,130 |
Payments made | (8,686 | ) |  | (4,134 | ) |  | (3,978 | )
Provisions | 11,233 |  |  | 3,601 |  |  | 4,317 |
Balance, end of period | $ | 10,483 |  |  | $ | 7,936 |  |  | $ | 8,469 |
Warranty expense: | $ | 11,233 |  |  | $ | 3,601 |  |  | $ | 4,317 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -URI http://asc.fasb.org/topic&trid=2155896 + Details
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