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Deferred Revenue and Customer Advances (Tables) | 3 Months Ended
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Apr. 04, 2021
Revenue Recognition and Deferred Revenue [Abstract] |
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:
|  | April 4, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
|  | (in thousands) |
Maintenance, service and training |  | $ | 78,321 |  |  | $ | 77,654 |
Customer advances, undelivered elements and other |  |  | 67,721 |  |  |  | 63,438 |
Extended warranty |  |  | 53,908 |  |  |  | 51,929 |
Total deferred revenue and customer advances |  | $ | 199,950 |  |  | $ | 193,021 |

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