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Deferred Revenue and Customer Advances | 9 Months Ended
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Oct. 01, 2017
Deferred Revenue and Customer Advances | H. 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:
|  | October 1, 2017 |  |  | December 31, 2016 |
|  | (in thousands) |
Extended warranty |  | $ | 26,492 |  |  | $ | 28,200 |
Customer advances, undelivered elements and other |  |  | 58,577 |  |  |  | 32,938 |
Maintenance and training |  |  | 58,123 |  |  |  | 46,803 |
Total |  | $ | 143,192 |  |  | $ | 107,941 |

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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 430 -URI http://asc.fasb.org/topic&trid=2122452 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration