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Goodwill and Identified Intangible Assets (Tables) | 6 Months Ended
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Jun. 28, 2013
Goodwill And Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the six months ended June 28, 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 |  |  | (114 | )
Balance at end of period |  | $ | 197,857 |
Summary of Goodwill and Identified Intangible Assets | The following is a summary of identified intangible assets (in thousands):
|  | June 28, 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 |  |  | $ | (112,156 | ) |  | $ | 23,988 |  |  | $ | 136,145 |  |  | $ | (102,449 | ) |  | $ | 33,696 |
Customer relationships/contracts |  |  | 67,098 |  |  |  | (50,984 | ) |  |  | 16,114 |  |  |  | 67,098 |  |  |  | (48,150 | ) |  |  | 18,948 |
Trademarks and tradenames |  |  | 11,361 |  |  |  | (9,855 | ) |  |  | 1,506 |  |  |  | 11,361 |  |  |  | (9,145 | ) |  |  | 2,216 |
Maintenance agreements and related relationships |  |  | 7,100 |  |  |  | (4,066 | ) |  |  | 3,034 |  |  |  | 7,100 |  |  |  | (3,513 | ) |  |  | 3,587 |
Total identifiable intangibles |  | $ | 221,704 |  |  | $ | (177,061 | ) |  | $ | 44,642 |  |  | $ | 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 six months ended June 28, 2013 and June 29, 2012 was allocated as follows (in thousands):
|  | Three months ended |  |  | Six months ended |
|  | June 28, 2013 |  |  | June 29, 2012 |  |  | June 28, 2013 |  |  | June 29, 2012 |
Included in cost of revenue |  | $ | 4,762 |  |  | $ | 5,048 |  |  | $ | 9,707 |  |  | $ | 10,408 |
Included in operating expenses |  |  | 2,010 |  |  |  | 2,190 |  |  |  | 4,098 |  |  |  | 4,369 |
Total amortization expense |  | $ | 6,772 |  |  | $ | 7,238 |  |  | $ | 13,805 |  |  | $ | 14,777 |
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 6 months) |  | $ | 9,525 |  |  | $ | 3,999 |  |  | $ | 13,524 |
2014 |  |  | 13,745 |  |  |  | 6,775 |  |  |  | 20,520 |
2015 |  |  | 719 |  |  |  | 5,783 |  |  |  | 6,502 |
2016 |  |  | — |  |  |  | 4,096 |  |  |  | 4,096 |
2017 |  |  | — |  |  |  | — |  |  |  | — |
Total future amortization expense |  | $ | 23,989 |  |  | $ | 20,653 |  |  | $ | 44,642 |

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