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Product warranties | 9 Months Ended
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Sep. 27, 2014
Product Warranties Disclosures [Abstract] |
Product warranties | Product warranties The Company warrants certain qualitative attributes of its products for up to 50 years. The Company records a provision for estimated warranty and related costs in accrued expenses, based on historical experience, and periodically adjusts these provisions to reflect actual experience. The activity related to warranty obligations is as follows:
| Three Months Ended |  | Nine Months Ended
| September 27, 2014 |  | September 28, 2013 |  | September 27, 2014 |  | September 28, 2013
Balance at beginning of period | $ | 32,236 |  |  | 33,674 |  |  | 35,818 |  |  | 32,930 |
Warranty claims paid during the period | (11,720 | ) |  | (12,144 | ) |  | (41,606 | ) |  | (41,751 | )
Acquisitions | — |  |  | 48 |  |  | — |  |  | 3,331 |
Warranty expense during the period | 10,487 |  |  | 11,989 |  |  | 36,791 |  |  | 39,057 |
Balance at end of period | $ | 31,003 |  |  | 33,567 |  |  | 31,003 |  |  | 33,567 |

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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 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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