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Intangible Assets Schedule of Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Schedule of Intangible Assets [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | The gross carrying amount and accumulated amortization of our intangible assets, other than goodwill, are as follows:
| December 31, 2016 |  | December 31, 2015
| Gross Assets |  | Accumulated Amortization |  | Net |  | Gross Assets |  | Accumulated Amortization |  | Net
| (in thousands)
Core-developed technology | $ | 372,568 |  |  | $ | (354,878 | ) |  | $ | 17,690 |  |  | $ | 388,981 |  |  | $ | (358,092 | ) |  | $ | 30,889 |
Customer contracts and relationships | 224,467 |  |  | (170,056 | ) |  | 54,411 |  |  | 238,379 |  |  | (168,885 | ) |  | 69,494 |
Trademarks and trade names | 61,785 |  |  | (61,766 | ) |  | 19 |  |  | 64,069 |  |  | (62,571 | ) |  | 1,498 |
Other | 11,076 |  |  | (11,045 | ) |  | 31 |  |  | 11,078 |  |  | (11,027 | ) |  | 51 |
Total intangible assets | $ | 669,896 |  |  | $ | (597,745 | ) |  | $ | 72,151 |  |  | $ | 702,507 |  |  | $ | (600,575 | ) |  | $ | 101,932 |
SummaryOfIntangibleAssetAccountActivity [Table Text Block] | A summary of the intangible asset account activity is as follows:
| Year Ended December 31,
| 2016 |  | 2015
| (in thousands)
Beginning balance, intangible assets, gross | $ | 702,507 |  |  | $ | 748,148 |
Intangible assets acquired | — |  |  | 4,827 |
Intangible assets impaired | — |  |  | (497 | )
Effect of change in exchange rates | (32,611 | ) |  | (49,971 | )
Ending balance, intangible assets, gross | $ | 669,896 |  |  | $ | 702,507 |
Finite-lived Intangible Assets Amortization Expense [Table Text Block] | A summary of intangible asset amortization expense is as follows:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (in thousands)
Amortization expense | $ | 25,112 |  |  | $ | 31,673 |  |  | $ | 43,619 |
Schedule of Finite-Lived 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 |  | $ | 17,914 |
2018 |  | 12,383 |
2019 |  | 9,695 |
2020 |  | 7,866 |
2021 |  | 6,845 |
Beyond 2021 |  | 17,448 |
Total intangible assets subject to amortization |  | $ | 72,151 |

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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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