| Changes in the carrying amount of goodwill |
The changes in the carrying amount of goodwill during the six months ended June 28, 2014 were as follows: | | | | | | Gross Carrying Amount | | (In thousands) | Balance as of December 28, 2013 | $ | 456,905 |
| Goodwill resulting from acquisitions | 102,025 |
| Measurement period adjustments | (436 | ) | Effect of foreign currency translation | 1,463 |
| Balance as of June 28, 2014 | $ | 559,957 |
|
|
| Schedule of acquired intangibles with finite and indefinite lives (excluding goodwill) |
Acquired intangibles as of December 28, 2013 were as follows, excluding intangibles that were fully amortized as of December 29, 2012: | | | | | | | | | | | | | | Gross Carrying Amount | | Accumulated Amortization | | Acquired Intangibles, Net | | (In thousands) | Existing technology | $ | 237,624 |
| | $ | (53,243 | ) | | $ | 184,381 |
| Agreements and relationships | 170,760 |
| | (53,607 | ) | | 117,153 |
| Distribution rights | 30,100 |
| | (30,100 | ) | | — |
| Tradenames, trademarks and patents | 9,519 |
| | (2,870 | ) | | 6,649 |
| Total acquired intangibles with definite lives | 448,003 |
| | (139,820 | ) | | 308,183 |
| In-process technology | 3,510 |
| | — |
| | 3,510 |
| Total acquired intangibles | $ | 451,513 |
| | $ | (139,820 | ) | | $ | 311,693 |
|
Acquired intangibles as of June 28, 2014 were as follows, excluding intangibles that were fully amortized as of December 28, 2013: | | | | | | | | | | | | | | Gross Carrying Amount | | Accumulated Amortization | | Acquired Intangibles, Net | | (In thousands) | Existing technology | $ | 319,593 |
| | $ | (65,059 | ) | | $ | 254,534 |
| Agreements and relationships | 175,499 |
| | (53,159 | ) | | 122,340 |
| Tradenames, trademarks and patents | 10,619 |
| | (3,579 | ) | | 7,040 |
| Total acquired intangibles with definite lives | 505,711 |
| | (121,797 | ) | | 383,914 |
| In-process technology | 11,516 |
| | — |
| | 11,516 |
| Total acquired intangibles | $ | 517,227 |
| | $ | (121,797 | ) | | $ | 395,430 |
|
|
| Amortization of acquired intangibles |
Amortization of acquired intangibles for the three and six months ended June 28, 2014 and June 29, 2013 was as follows: | | | | | | | | | | | | | | | | | | Three Months Ended | | Six Months Ended | | June 28,
2014 | | June 29,
2013 | | June 28,
2014 | | June 29,
2013 | | (In thousands) | Cost of product and maintenance | $ | 8,613 |
| | $ | 5,760 |
| | $ | 16,189 |
| | $ | 9,567 |
| Amortization of acquired intangibles | 5,579 |
| | 5,327 |
| | 10,789 |
| | 9,118 |
| Total amortization of acquired intangibles | $ | 14,192 |
| | $ | 11,087 |
| | $ | 26,978 |
| | $ | 18,685 |
|
|
| Estimated amortization expense |
Estimated amortization expense for intangible assets with definite lives for the following five fiscal years and thereafter is as follows: | | | | | | (In thousands) | 2014 – remaining period | $ | 32,522 |
| 2015 | 63,522 |
| 2016 | 56,646 |
| 2017 | 51,695 |
| 2018 | 48,059 |
| Thereafter | 131,470 |
| Total estimated amortization expense | $ | 383,914 |
|
|