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Deferred Revenue and Customer Advances | 6 Months Ended
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Jun. 29, 2014
Deferred Revenue and Customer Advances | G. Deferred Revenue and Customer Advances Deferred revenue and customer advances consist of the following and are included in short and long-term deferred revenue and customer advances on the balance sheet:
|  | June 29, 2014 |  |  | December 31, 2013 |
|  | (in thousands) |
Extended warranty |  | $ | 40,052 |  |  | $ | 34,909 |
Equipment maintenance and training |  |  | 26,535 |  |  |  | 22,455 |
Customer advances |  |  | 8,926 |  |  |  | 4,825 |
Undelivered elements |  |  | 5,831 |  |  |  | 6,971 |
Customer acceptance |  |  | 1,616 |  |  |  | — |
Total deferred revenue and customer advances |  | $ | 82,960 |  |  | $ | 69,160 |

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- Definition The entire disclosure for deferred revenues at the end of the reporting period, and description and amounts of significant changes that occurred during the reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.3(b).Q1(c),(b).Q2,(c).Q3) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration