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Goodwill and Identified Intangible Assets (Tables) | 9 Months Ended
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Sep. 27, 2013
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the nine months ended September 27, 2013 are as follows (in thousands):
Balance at beginning of period | $ | 212,518 |
Reduction in goodwill associated with the sale of the cable access HFC Business | (14,547 | )
Foreign currency translation adjustment | (15 | )
Balance at end of period | $ | 197,956 |
Summary of Goodwill and Identified Intangible Assets | The following is a summary of identified intangible assets (in thousands):
| September 27, 2013 |  | December 31, 2012
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Identifiable intangibles: |  |  |  |  |  |  |  |  |  |  |
Developed core technology | $ | 136,145 |  |  | $ | (116,918 | ) |  | $ | 19,227 |  |  | $ | 136,145 |  |  | $ | (102,449 | ) |  | $ | 33,696 |
Customer relationships/contracts | 67,098 |  |  | (52,381 | ) |  | 14,717 |  |  | 67,098 |  |  | (48,150 | ) |  | 18,948 |
Trademarks and tradenames | 11,361 |  |  | (10,210 | ) |  | 1,151 |  |  | 11,361 |  |  | (9,145 | ) |  | 2,216 |
Maintenance agreements and related relationships | 7,100 |  |  | (4,317 | ) |  | 2,783 |  |  | 7,100 |  |  | (3,513 | ) |  | 3,587 |
Total identifiable intangibles | $ | 221,704 |  |  | $ | (183,826 | ) |  | $ | 37,878 |  |  | $ | 221,704 |  |  | $ | (163,257 | ) |  | $ | 58,447 |
Amortization Expense for Identifiable Purchased Intangible Assets | Amortization expense for the identifiable purchased intangible assets for the three and nine months ended September 27, 2013 and September 28, 2012 was allocated as follows (in thousands):
| Three months ended |  | Nine months ended
| September 27, 2013 |  | September 28, 2012 |  | September 27, 2013 |  | September 28, 2012
Included in cost of revenue | $ | 4,763 |  |  | $ | 5,048 |  |  | $ | 14,470 |  |  | $ | 15,456 |
Included in operating expenses | 2,001 |  |  | 2,179 |  |  | 6,099 |  |  | 6,548 |
Total amortization expense | $ | 6,764 |  |  | $ | 7,227 |  |  | $ | 20,569 |  |  | $ | 22,004 |
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, |  |  |  |  |
2013 (remaining 3 months) | $ | 4,763 |  |  | $ | 1,997 |  |  | $ | 6,760 |
2014 | 13,745 |  |  | 6,775 |  |  | 20,520 |
2015 | 719 |  |  | 5,783 |  |  | 6,502 |
2016 | — |  |  | 4,096 |  |  | 4,096 |
2017 | — |  |  | — |  |  | — |
Total future amortization expense | $ | 19,227 |  |  | $ | 18,651 |  |  | $ | 37,878 |

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