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Deferred Revenue and Customer Advances (Tables) | 6 Months Ended
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Jun. 28, 2020
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:
|  | June 28, 2020 |  |  | December 31, 2019 |
|  | (in thousands) |
Maintenance, service and training |  | $ | 75,144 |  |  | $ | 63,815 |
Extended warranty |  |  | 40,178 |  |  |  | 30,677 |
Customer advances, undelivered elements and other |  |  | 64,536 |  |  |  | 56,358 |
Total deferred revenue and customer advances |  | $ | 179,858 |  |  | $ | 150,850 |

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