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Schedule of Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Schedule of Intangible Assets by Major Class [Table Text Block] | The gross carrying amount and accumulated amortization (accretion) of our intangible assets and liabilities, other than goodwill, were as follows:
| March 31, 2018 |  | December 31, 2017
| Gross |  | Accumulated (Amortization) Accretion |  | Net |  | Gross |  | Accumulated (Amortization) Accretion |  | Net
| (in thousands)
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Core-developed technology | $ | 531,263 |  |  | $ | (423,634 | ) |  | $ | 107,629 |  |  | $ | 429,548 |  |  | $ | (399,969 | ) |  | $ | 29,579 |
Customer contracts and relationships | 400,566 |  |  | (210,757 | ) |  | 189,809 |  |  | 258,586 |  |  | (197,582 | ) |  | 61,004 |
Trademarks and trade names | 82,337 |  |  | (68,982 | ) |  | 13,355 |  |  | 70,056 |  |  | (66,004 | ) |  | 4,052 |
Other | 11,664 |  |  | (11,073 | ) |  | 591 |  |  | 11,661 |  |  | (11,068 | ) |  | 593 |
Total intangible assets subject to amortization | $ | 1,025,830 |  |  | $ | (714,446 | ) |  | $ | 311,384 |  |  | $ | 769,851 |  |  | $ | (674,623 | ) |  | $ | 95,228 |
In-process research and development | 7,600 |  |  | — |  |  | 7,600 |  |  | — |  |  | — |  |  | — |
Total intangible assets | $ | 1,033,430 |  |  | $ | (714,446 | ) |  | $ | 318,984 |  |  | $ | 769,851 |  |  | $ | (674,623 | ) |  | $ | 95,228 |
Intangible Liabilities |  |  |  |  |  |  |  |  |  |  |
Customer contracts and relationships | $ | (23,900 | ) |  | $ | 1,304 |  |  | $ | (22,596 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |
Summary of Intangible Asset Account Activity [Table Text Block] | A summary of intangible assets and liabilities activity is as follows:
| Three Months Ended March 31,
| 2018 |  | 2017
| (in thousands)
Beginning balance, intangible assets, gross | $ | 769,851 |  |  | $ | 669,896 |
Intangible assets acquired | 240,600 |  |  | — |
Effect of change in exchange rates | 22,979 |  |  | 16,168 |
Ending balance, intangible assets, gross | $ | 1,033,430 |  |  | $ | 686,064 |
Beginning balance, intangible liabilities, gross | $ | — |  |  | $ | — |
Intangible liabilities acquired | (23,900 | ) |  | — |
Effect of change in exchange rates | — |  |  | — |
Ending balance, intangible liabilities, gross | $ | (23,900 | ) |  | $ | — |
Schedule of Intangible Assets, Future Amortization Expense [Table Text Block] | Estimated future annual amortization (accretion) is as follows:
Year Ending December 31, |  | Amortization |  | Accretion |  | Estimated Annual Amortization, net
|  | (in thousands)
2018 (amount remaining at March 31, 2018) |  | $ | 58,564 |  |  | $ | (3,913 | ) |  | $ | 54,651 |
2019 |  | 72,345 |  |  | (8,233 | ) |  | 64,112 |
2020 |  | 52,265 |  |  | (8,028 | ) |  | 44,237 |
2021 |  | 36,649 |  |  | (1,963 | ) |  | 34,686 |
2022 |  | 26,317 |  |  | (459 | ) |  | 25,858 |
Beyond 2022 |  | 65,244 |  |  | — |  |  | 65,244 |
Total intangible assets subject to amortization (accretion) |  | $ | 311,384 |  |  | $ | (22,596 | ) |  | $ | 288,788 |

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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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