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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 28, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Summary of Changes in Goodwill | The following table summarizes changes in goodwill during the nine months ended September 28, 2018 (in thousands):
Balance at beginning of the period | $ | 210,988 |
Goodwill acquired from acquisitions |  | 11,862 |
Effect of foreign exchange rate changes |  | (3,078 | )
Balance at end of the period | $ | 219,772 |
Goodwill by Reportable Segment | Goodwill by reportable segment as of September 28, 2018 was as follows (in thousands):
| Reportable Segment |  |  |  |  |
| Photonics |  |  | Vision |  |  | Precision Motion |  |  | Total |
Goodwill | $ | 169,803 |  |  | $ | 156,129 |  |  | $ | 45,069 |  |  | $ | 371,001 |
Accumulated impairment of goodwill |  | (102,461 | ) |  |  | (31,722 | ) |  |  | (17,046 | ) |  |  | (151,229 | )
Total | $ | 67,342 |  |  | $ | 124,407 |  |  | $ | 28,023 |  |  | $ | 219,772 |
Goodwill by reportable segment as of December 31, 2017 was as follows (in thousands):
| Reportable Segment |  |  |  |  |
| Photonics |  |  | Vision |  |  | Precision Motion |  |  | Total |
Goodwill | $ | 170,818 |  |  | $ | 157,436 |  |  | $ | 33,963 |  |  | $ | 362,217 |
Accumulated impairment of goodwill |  | (102,461 | ) |  |  | (31,722 | ) |  |  | (17,046 | ) |  |  | (151,229 | )
Total | $ | 68,357 |  |  | $ | 125,714 |  |  | $ | 16,917 |  |  | $ | 210,988 |
Intangible Assets | Intangible assets as of September 28, 2018 and December 31, 2017, respectively, are summarized as follows (in thousands):
| September 28, 2018 |  |  | December 31, 2017 |
| Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Amortizable intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patents and developed technologies | $ | 134,144 |  |  | $ | (84,359 | ) |  | $ | 49,785 |  |  | $ | 130,890 |  |  | $ | (77,295 | ) |  | $ | 53,595 |
Customer relationships |  | 140,539 |  |  |  | (61,253 | ) |  |  | 79,286 |  |  |  | 131,809 |  |  |  | (52,015 | ) |  |  | 79,794 |
Customer backlog |  | 1,779 |  |  |  | (761 | ) |  |  | 1,018 |  |  |  | 2,524 |  |  |  | (2,284 | ) |  |  | 240 |
Non-compete covenant |  | 2,514 |  |  |  | (2,358 | ) |  |  | 156 |  |  |  | 2,514 |  |  |  | (1,956 | ) |  |  | 558 |
Trademarks and trade names |  | 16,064 |  |  |  | (8,688 | ) |  |  | 7,376 |  |  |  | 15,708 |  |  |  | (7,874 | ) |  |  | 7,834 |
Amortizable intangible assets |  | 295,040 |  |  |  | (157,419 | ) |  |  | 137,621 |  |  |  | 283,445 |  |  |  | (141,424 | ) |  |  | 142,021 |
Non-amortizable intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names |  | 13,027 |  |  |  | — |  |  |  | 13,027 |  |  |  | 13,027 |  |  |  | — |  |  |  | 13,027 |
Totals | $ | 308,067 |  |  | $ | (157,419 | ) |  | $ | 150,648 |  |  | $ | 296,472 |  |  | $ | (141,424 | ) |  | $ | 155,048 |
Amortization Expense of Intangible Assets | Amortization expense was as follows (in thousands):
| Three Months Ended |  |  | Nine Months Ended |
| September 28, |  |  | September 29, |  |  | September 28, |  |  | September 29, |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Amortization expense – cost of revenue | $ | 2,492 |  |  | $ | 2,741 |  |  | $ | 7,461 |  |  | $ | 6,078 |
Amortization expense – operating expenses |  | 3,947 |  |  |  | 3,217 |  |  |  | 11,538 |  |  |  | 9,413 |
Total amortization expense | $ | 6,439 |  |  | $ | 5,958 |  |  | $ | 18,999 |  |  | $ | 15,491 |
Estimated Amortization Expense | Estimated amortization expense for each of the five succeeding years and thereafter as of September 28, 2018 was as follows (in thousands):
Year Ending December 31, |  | Cost of Revenue |  |  | Operating Expenses |  |  | Total |
2018 (remainder of year) |  | $ | 2,532 |  |  | $ | 4,068 |  |  | $ | 6,600 |
2019 |  |  | 9,256 |  |  |  | 14,945 |  |  |  | 24,201 |
2020 |  |  | 8,338 |  |  |  | 12,602 |  |  |  | 20,940 |
2021 |  |  | 7,407 |  |  |  | 11,683 |  |  |  | 19,090 |
2022 |  |  | 6,289 |  |  |  | 9,829 |  |  |  | 16,118 |
Thereafter |  |  | 15,963 |  |  |  | 34,709 |  |  |  | 50,672 |
Total |  | $ | 49,785 |  |  | $ | 87,836 |  |  | $ | 137,621 |

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