| Schedule of Finite-Lived Intangible Assets |
The intangible assets consisted of the following (in thousands): | | | March 31, 2014 | | December 31, 2013 | | | | Gross | | | | | Gross | | | | | | | Carrying | | Accumulated | | Carrying | | Accumulated | | | | Amount | | Amortization | | Amount | | Amortization | | Developed technology | | $ | 462,289 | | $ | 67,107 | | $ | 447,842 | | $ | 54,029 | | Patents | | | 14,209 | | | 6,922 | | | 14,065 | | | 6,523 | | Trademarks and trade names | | | 59,034 | | | 5,226 | | | 59,019 | | | 3,817 | | Customer relationships | | | 101,566 | | | 14,081 | | | 100,679 | | | 10,793 | | Non-compete agreement | | | 10,354 | | | 1,903 | | | 10,354 | | | 1,249 | | Capitalized software development costs | | | 16,889 | | | 13,963 | | | 16,612 | | | 13,828 | | In process research and development | | | 49,675 | | | - | | | 63,998 | | | - | | | | | 714,016 | | $ | 109,202 | | | 712,569 | | $ | 90,239 | | Accumulated amortization | | | 109,202 | | | | | | 90,239 | | | | | Net book value of amortizable intangible assets | | $ | 604,814 | | | | | $ | 622,330 | | | |
|
| Schedule of Finite-Lived Intangible Assets, Future Amortization Expense |
As of March 31, 2014, estimated amortization expense relating to intangible assets currently subject to amortization for each of the next five years and thereafter was as follows (in thousands) | Year ending December 31, | | | | | | Remaining 9 months of 2014 | | | $ | 57,537 | | 2015 | | | | 74,916 | | 2016 | | | | 74,810 | | 2017 | | | | 73,514 | | 2018 | | | | 67,601 | | Thereafter | | | | 206,761 |
|