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Revenue from Contracts with Customers (Tables) | 3 Months Ended
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Mar. 31, 2018
Schedule of Deferred Revenue by Arrangement | A rollforward of the Company’s deferred revenue is as follows:
|  | Three Months Ended March 31, 2018 |
Beginning balance, January 1(1) |  | $ | 14,448 |
Amount of deferred revenue recognized in income |  |  | (4,757 | )
Additions to deferred revenue |  |  | 7,639 |
Ending balance, March 31(2) |  | $ | 17,330 |
| (1) | Beginning deferred revenue as of January 1, 2018 includes $11,322 of current deferred revenue and $3,126 of long-term deferred revenue.
| (2) | Ending deferred revenue as of March 31, 2018 includes $14,003 of current deferred revenue and $3,327 of long-term deferred revenue.
Summary of Revenue from Contracts with Customers | The following table summarizes revenue from contracts with customers:
|  | Three Months Ended March 31, 2018 |
|  | Vacuum & Analysis |  |  | Light & Motion |  |  | Total |
Net revenues: |  |  |  |  |  |  |  |  |  |  |  |
Products |  | $ | 304,336 |  |  | $ | 192,341 |  |  | $ | 496,677 |
Services |  |  | 44,008 |  |  |  | 13,590 |  |  |  | 57,598 |
Total net revenues |  | $ | 348,344 |  |  | $ | 205,931 |  |  | $ | 554,275 |
|  | Three Months Ended March 31, 2017 |
|  | Vacuum & Analysis |  |  | Light & Motion |  |  | Total |
Net revenues: |  |  |  |  |  |  |  |  |  |  |  |
Products |  | $ | 241,455 |  |  | $ | 146,483 |  |  | $ | 387,938 |
Services |  |  | 36,529 |  |  |  | 12,686 |  |  |  | 49,215 |
Total net revenues |  | $ | 277,984 |  |  | $ | 159,169 |  |  | $ | 437,153 |
Market Segment [Member] |
Summary of Revenue from Contracts with Customers | The following table summarizes revenue from contracts with customers by major market:
|  | Three Months Ended March 31, 2018 |
|  | Vacuum & Analysis |  |  | Light & Motion |  |  | Total |
Net revenues: |  |  |  |  |  |  |  |  |  |  |  |
Semiconductor |  | $ | 275,701 |  |  | $ | 37,813 |  |  | $ | 313,514 |
Advanced markets |  |  | 72,643 |  |  |  | 168,118 |  |  |  | 240,761 |
Total net revenues |  | $ | 348,344 |  |  | $ | 205,931 |  |  | $ | 554,275 |
|  | Three Months Ended March 31, 2017 |
|  | Vacuum & Analysis |  |  | Light & Motion |  |  | Total |
Net revenues: |  |  |  |  |  |  |  |  |  |  |  |
Semiconductor |  | $ | 218,804 |  |  | $ | 29,700 |  |  | $ | 248,504 |
Advanced markets |  |  | 59,180 |  |  |  | 129,469 |  |  |  | 188,649 |
Total net revenues |  | $ | 277,984 |  |  | $ | 159,169 |  |  | $ | 437,153 |

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