| Schedule of Intangible Assets by Major Class [Table Text Block] |
The gross carrying amount and accumulated amortization of our intangible assets, other than goodwill, are as follows:
| | | | | | | | | | | | | | | | | | | | | | | | | | March 31, 2013 | | December 31, 2012 | | Gross Assets | | Accumulated Amortization | | Net | | Gross Assets | | Accumulated Amortization | | Net | | (in thousands) | Core-developed technology | $ | 418,123 |
| | $ | (331,603 | ) | | $ | 86,520 |
| | $ | 407,024 |
| | $ | (332,763 | ) | | $ | 74,261 |
| Customer contracts and relationships | 281,697 |
| | (154,042 | ) | | 127,655 |
| | 292,252 |
| | (154,890 | ) | | 137,362 |
| Trademarks and trade names | 71,004 |
| | (64,100 | ) | | 6,904 |
| | 72,770 |
| | (65,090 | ) | | 7,680 |
| Other | 11,092 |
| | (11,024 | ) | | 68 |
| | 11,094 |
| | (11,026 | ) | | 68 |
| Total intangible assets subject to amortization | 781,916 |
| | (560,769 | ) | | 221,147 |
| | 783,140 |
| | (563,769 | ) | | 219,371 |
| In-process research and development | — |
| | | | — |
| | 19,400 |
| | | | 19,400 |
| Total intangible assets | $ | 781,916 |
| | $ | (560,769 | ) | | $ | 221,147 |
| | $ | 802,540 |
| | $ | (563,769 | ) | | $ | 238,771 |
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| Summary of Intangible Asset Account Activity [Table Text Block] |
A summary of the intangible asset account activity is as follows:
| | | | | | | | | | Three Months Ended March 31, | | 2013 | | 2012 | | (in thousands) | Beginning balance, intangible assets, gross | $ | 802,540 |
| | $ | 749,194 |
| Effect of change in exchange rates | (20,624 | ) | | 16,518 |
| Ending balance, intangible assets, gross | $ | 781,916 |
| | $ | 765,712 |
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| Schedule of Intangible Assets, Future Amortization Expense [Table Text Block] |
Estimated future annual amortization expense is as follows:
| | | | | Years ending December 31, | Estimated Annual Amortization | | (in thousands) | 2013 (amount remaining at March 31, 2013) | $ | 30,901 |
| 2014 | 43,672 |
| 2015 | 35,055 |
| 2016 | 27,306 |
| 2017 | 20,295 |
| Beyond 2017 | 63,918 |
| Total intangible assets, net | $ | 221,147 |
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