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Goodwill and Identified Intangible Assets (Tables) | 6 Months Ended
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Jun. 29, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill by reportable segments for the six months ended June 29, 2018 were as follows (in thousands):
| Video |  | Cable Access |  | Total
Balance as of December 31, 2017 | $ | 182,012 |  |  | $ | 60,815 |  |  | $ | 242,827 |
Foreign currency translation adjustment | (1,633 | ) |  | (18 | ) |  | (1,651 | )
Balance as of June 29, 2018 | $ | 180,379 |  |  | $ | 60,797 |  |  | $ | 241,176 |
Summary of Goodwill and Identified Intangible Assets | The following is a summary of intangible assets (in thousands):
|  |  | June 29, 2018 |  | December 31, 2017
| Weighted Average Remaining Life (Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Developed core technology | 1.7 |  | $ | 31,707 |  |  | $ | (22,985 | ) |  | $ | 8,722 |  |  | $ | 31,707 |  |  | $ | (20,396 | ) |  | $ | 11,311 |
Customer relationships/contracts | 2.7 |  | 44,690 |  |  | (36,664 | ) |  | 8,026 |  |  | 44,819 |  |  | (35,205 | ) |  | 9,614 |
Trademarks and trade names | 1.7 |  | 630 |  |  | (368 | ) |  | 262 |  |  | 654 |  |  | (300 | ) |  | 354 |
Maintenance agreements and related relationships | n/a |  | 5,500 |  |  | (5,500 | ) |  | — |  |  | 5,500 |  |  | (5,500 | ) |  | — |
Order Backlog | n/a |  | 3,128 |  |  | (3,128 | ) |  | — |  |  | 3,177 |  |  | (3,177 | ) |  | — |
Total identifiable intangibles |  |  | $ | 85,655 |  |  | $ | (68,645 | ) |  | $ | 17,010 |  |  | $ | 85,857 |  |  | $ | (64,578 | ) |  | $ | 21,279 |
Amortization Expense for Identifiable Purchased Intangible Assets | Amortization expense for the identifiable purchased intangible assets for the three and six months ended June 29, 2018 and June 30, 2017 was allocated as follows (in thousands):
| Three months ended | Six months ended
| June 29, 2018 |  | June 30, 2017 | June 29, 2018 |  | June 30, 2017
Included in cost of revenue | $ | 1,295 |  |  | $ | 1,295 |  | $ | 2,590 |  |  | $ | 2,590 |
Included in operating expenses | 800 |  |  | 780 |  | 1,604 |  |  | 1,554 |
Total amortization expense | $ | 2,095 |  |  | $ | 2,075 |  | $ | 4,194 |  |  | $ | 4,144 |
Estimated Future Amortization Expense of Purchased Intangible Assets | The estimated future amortization expense of purchased intangible assets with definite lives is as follows (in thousands):
| Cost of Revenue |  | Operating Expenses |  | Total
Year ended December 31, |  |  |  |  |
2018 (remaining six months) | $ | 2,590 |  |  | $ | 1,584 |  |  | $ | 4,174 |
2019 | 5,180 |  |  | 3,167 |  |  | 8,347 |
2020 | 951 |  |  | 3,036 |  |  | 3,987 |
2021 | — |  |  | 502 |  |  | 502 |
Total future amortization expense | $ | 8,721 |  |  | $ | 8,289 |  |  | $ | 17,010 |

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