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Schedule of Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
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, 2017 |  | December 31, 2016
| Gross Assets |  | Accumulated Amortization |  | Net |  | Gross Assets |  | Accumulated Amortization |  | Net
| (in thousands)
Core-developed technology | $ | 425,198 |  |  | $ | (393,831 | ) |  | $ | 31,367 |  |  | $ | 372,568 |  |  | $ | (354,878 | ) |  | $ | 17,690 |
Customer contracts and relationships | 256,840 |  |  | (193,317 | ) |  | 63,523 |  |  | 224,467 |  |  | (170,056 | ) |  | 54,411 |
Trademarks and trade names | 69,706 |  |  | (65,537 | ) |  | 4,169 |  |  | 61,785 |  |  | (61,766 | ) |  | 19 |
Other | 11,582 |  |  | (11,062 | ) |  | 520 |  |  | 11,076 |  |  | (11,045 | ) |  | 31 |
Total intangible assets subject to amortization | $ | 763,326 |  |  | $ | (663,747 | ) |  | $ | 99,579 |  |  | $ | 669,896 |  |  | $ | (597,745 | ) |  | $ | 72,151 |
In-process research and development | 710 |  |  | — |  |  | 710 |  |  | — |  |  | — |  |  | — |
Total intangible assets | $ | 764,036 |  |  | $ | (663,747 | ) |  | $ | 100,289 |  |  | $ | 669,896 |  |  | $ | (597,745 | ) |  | $ | 72,151 |
Summary of Intangible Asset Account Activity [Table Text Block] | A summary of intangible asset activity is as follows:
| Nine Months Ended September 30,
| 2017 |  | 2016
| (in thousands)
Beginning balance, intangible assets, gross | $ | 669,896 |  |  | $ | 702,507 |
Intangible assets acquired | 36,500 |  |  | — |
Effect of change in exchange rates | 57,640 |  |  | 2,309 |
Ending balance, intangible assets, gross | $ | 764,036 |  |  | $ | 704,816 |
Schedule of Intangible Assets, Future Amortization Expense [Table Text Block] | Estimated future annual amortization expense is as follows:
Year Ending December 31, |  | Estimated Annual Amortization
|  | (in thousands)
2017 (amount remaining at September 30, 2017) |  | $ | 5,605 |
2018 |  | 19,065 |
2019 |  | 16,302 |
2020 |  | 14,003 |
2021 |  | 11,995 |
Beyond 2021 |  | 32,609 |
Total intangible assets subject to amortization |  | $ | 99,579 |

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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 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: 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=66006027&loc=d3e16265-109275 + Details
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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=66006027&loc=d3e16323-109275 + Details
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