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Goodwill and Identified Intangible Assets (Tables) | 3 Months Ended
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Mar. 28, 2014
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the three months ended March 28, 2014 are as follows (in thousands):
Balance at beginning of period | $ | 198,022 |
Foreign currency translation adjustment | 14 |
Balance at end of period | $ | 198,036 |
Summary of Goodwill and Identified Intangible Assets | The following is a summary of identified intangible assets (in thousands):
|  |  | March 28, 2014 |  | December 31, 2013
| Range of Useful Lives |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Identifiable intangibles: |  |  |  |  |  |  |  |  |  |  |  |  |
Developed core technology | 4-6 years |  | $ | 136,145 |  |  | $ | (126,397 | ) |  | $ | 9,748 |  |  | $ | 136,145 |  |  | $ | (121,681 | ) |  | $ | 14,464 |
Customer relationships/contracts | 5-6 years |  | 67,098 |  |  | (55,134 | ) |  | 11,964 |  |  | 67,098 |  |  | (53,772 | ) |  | 13,326 |
Trademarks and tradenames | 4-5 years |  | 11,361 |  |  | (10,902 | ) |  | 459 |  |  | 11,361 |  |  | (10,565 | ) |  | 796 |
Maintenance agreements and related relationships | 6-7 years |  | 7,100 |  |  | (4,818 | ) |  | 2,282 |  |  | 7,100 |  |  | (4,567 | ) |  | 2,533 |
Total identifiable intangibles |  |  | $ | 221,704 |  |  | $ | (197,251 | ) |  | $ | 24,453 |  |  | $ | 221,704 |  |  | $ | (190,585 | ) |  | $ | 31,119 |
Amortization Expense for Identifiable Purchased Intangible Assets | Amortization expense for the identifiable purchased intangible assets for the three months ended March 28, 2014 and March 29, 2013 was allocated as follows (in thousands):
| Three months ended
| March 28, 2014 |  | March 29, 2013
Included in cost of revenue | $ | 4,716 |  |  | $ | 4,945 |
Included in operating expenses | 1,950 |  |  | 2,088 |
Total amortization expense | $ | 6,666 |  |  | $ | 7,033 |
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, |  |  |  |  |
2014 (remaining 9 months) | $ | 9,029 |  |  | $ | 4,825 |  |  | $ | 13,854 |
2015 | 719 |  |  | 5,783 |  |  | 6,502 |
2016 | — |  |  | 4,097 |  |  | 4,097 |
2017 | — |  |  | — |  |  | — |
2018 | — |  |  | — |  |  | — |
Total future amortization expense | $ | 9,748 |  |  | $ | 14,705 |  |  | $ | 24,453 |

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