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Goodwill and Identified Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Identified Intangible Assets | The following is a summary of identified intangible assets (in thousands):
|  |  | December 31, 2013 |  | December 31, 2012
| 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 |  |  | $ | (121,681 | ) |  | $ | 14,464 |  |  | $ | 136,145 |  |  | $ | (102,449 | ) |  | $ | 33,696 |
Customer relationships/contracts | 5-6 years |  | 67,098 |  |  | (53,772 | ) |  | 13,326 |  |  | 67,098 |  |  | (48,150 | ) |  | 18,948 |
Trademarks and tradenames | 4-5 years |  | 11,361 |  |  | (10,565 | ) |  | 796 |  |  | 11,361 |  |  | (9,145 | ) |  | 2,216 |
Maintenance agreements and related relationships | 6-7 years |  | 7,100 |  |  | (4,567 | ) |  | 2,533 |  |  | 7,100 |  |  | (3,513 | ) |  | 3,587 |
Total identifiable intangibles |  |  | $ | 221,704 |  |  | $ | (190,585 | ) |  | $ | 31,119 |  |  | $ | 221,704 |  |  | $ | (163,257 | ) |  | $ | 58,447 |
Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the years ended December 31, 2013 and 2012 are as follows (in thousands):
| December 31,
| 2013 |  | 2012
Balance at beginning of period | $ | 212,518 |  |  | $ | 212,417 |
Reduction in goodwill associated with the sale of the cable access HFC Business | (14,547 | ) |  | — |
Foreign currency translation adjustment | 51 |  |  | 101 |
Balance at end of period | $ | 198,022 |  |  | $ | 212,518 |
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 | $ | 13,745 |  |  | $ | 6,775 |  |  | $ | 20,520 |
2015 | 719 |  |  | 5,783 |  |  | 6,502 |
2016 | — |  |  | 4,097 |  |  | 4,097 |
2017 | — |  |  | — |  |  | — |
2018 | — |  |  | — |  |  | — |
Total future amortization expense | $ | 14,464 |  |  | $ | 16,655 |  |  | $ | 31,119 |

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 + Details
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