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Product Warranties | 12 Months Ended
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Dec. 31, 2013
Guarantees [Abstract] |
Product Warranties | 11. PRODUCT WARRANTIES Product warranty activity for the years ended December 31 was as follows (in thousands):
|  | 2013 |  |  | 2012 |  |  | 2011 |
Balance at the beginning of the period |  | $ | 364 |  |  | $ | 572 |  |  | $ | 649 |
Accruals for warranties for products sold in the period |  |  | 327 |  |  |  | 439 |  |  |  | 1,392 |
Fulfillment of warranty obligations |  |  | (297 | ) |  |  | (554 | ) |  |  | (1,134 | )
Revisions of estimated obligations |  |  | (111 | ) |  |  | (93 | ) |  |  | (335 | )
Balance at the end of the period |  | $ | 283 |  |  | $ | 364 |  |  | $ | 572 |

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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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