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Accrued Warranty Costs (Tables) | 12 Months Ended
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Dec. 31, 2011
Accrued Warranty Costs [Abstract] |
Product warranty obligation |
|  | 2011 |  |  | 2010 |  |  | 2009 |
|  | (In Thousands) |
Balance at beginning of year |  | $ | 3,996 |  |  | $ | 3,138 |  |  | $ | 2,820 |
Amounts charged to costs and expenses |  |  | 6,539 |  |  |  | 4,479 |  |  |  | 5,252 |
Costs incurred |  |  | (5,165 | ) |  |  | (3,621 | ) |  |  | (4,934 | )
Balance at end of year |  | $ | 5,370 |  |  | $ | 3,996 |  |  | $ | 3,138 |

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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 460 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 8 -Section 50 -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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