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Product warranties | 12 Months Ended
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Dec. 31, 2012
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. Product warranties are as follows:
| 2012 |  | 2011 |  | 2010
Balance at beginning of year | $ | 30,144 |  |  | 37,265 |  |  | 66,545 |
Warranty claims paid during the year | (55,314 | ) |  | (57,163 | ) |  | (77,017 | )
Pre-existing warranty accrual adjustment during the year | — |  |  | 4,473 |  |  | 2,261 |
Warranty expense during the year | 58,100 |  |  | 45,569 |  |  | 45,476 |
Balance at end of year | $ | 32,930 |  |  | 30,144 |  |  | 37,265 |

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 14 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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