| Schedule of Intangible Assets by Major Class [Table Text Block] |
The gross carrying amount and accumulated amortization of our intangible assets, other than goodwill, were as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | September 30, 2014 | | December 31, 2013 | | Gross Assets | | Accumulated Amortization | | Net | | Gross Assets | | Accumulated Amortization | | Net | | (in thousands) | Core-developed technology | $ | 414,289 |
| | $ | (361,336 | ) | | $ | 52,953 |
| | $ | 428,890 |
| | $ | (356,017 | ) | | $ | 72,873 |
| Customer contracts and relationships | 274,073 |
| | (176,036 | ) | | 98,037 |
| | 291,185 |
| | (173,952 | ) | | 117,233 |
| Trademarks and trade names | 70,046 |
| | (66,146 | ) | | 3,900 |
| | 73,117 |
| | (67,449 | ) | | 5,668 |
| Other | 11,584 |
| | (11,042 | ) | | 542 |
| | 11,089 |
| | (11,023 | ) | | 66 |
| Total intangible assets | $ | 769,992 |
| | $ | (614,560 | ) | | $ | 155,432 |
| | $ | 804,281 |
| | $ | (608,441 | ) | | $ | 195,840 |
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| Summary of Intangible Asset Account Activity [Table Text Block] |
A summary of intangible asset activity is as follows: | | | | | | | | | | Nine Months Ended September 30, | | 2014 | | 2013 | | (in thousands) | Beginning balance, intangible assets, gross | $ | 804,281 |
| | $ | 802,540 |
| Intangible assets acquired | 1,453 |
| | (1,500 | ) | Effect of change in exchange rates | (35,742 | ) | | (3,000 | ) | Ending balance, intangible assets, gross | $ | 769,992 |
| | $ | 798,040 |
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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) | 2014 (amount remaining at September 30, 2014) | | $ | 10,701 |
| 2015 | | 34,505 |
| 2016 | | 27,234 |
| 2017 | | 20,169 |
| 2018 | | 14,102 |
| Beyond 2018 | | 48,721 |
| Total intangible assets subject to amortization | | $ | 155,432 |
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