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Intangible Assets (Text Block) | 12 Months Ended
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Dec. 31, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets [Text Block] | Intangible Assets The gross carrying amount and accumulated amortization of our intangible assets, other than goodwill, are as follows:
| December 31, 2017 |  | December 31, 2016
| Gross Assets |  | Accumulated Amortization |  | Net |  | Gross Assets |  | Accumulated Amortization |  | Net
| (in thousands)
Core-developed technology | $ | 429,548 |  |  | $ | (399,969 | ) |  | $ | 29,579 |  |  | $ | 372,568 |  |  | $ | (354,878 | ) |  | $ | 17,690 |
Customer contracts and relationships | 258,586 |  |  | (197,582 | ) |  | 61,004 |  |  | 224,467 |  |  | (170,056 | ) |  | 54,411 |
Trademarks and trade names | 70,056 |  |  | (66,004 | ) |  | 4,052 |  |  | 61,785 |  |  | (61,766 | ) |  | 19 |
Other | 11,661 |  |  | (11,068 | ) |  | 593 |  |  | 11,076 |  |  | (11,045 | ) |  | 31 |
Total intangible assets | $ | 769,851 |  |  | $ | (674,623 | ) |  | $ | 95,228 |  |  | $ | 669,896 |  |  | $ | (597,745 | ) |  | $ | 72,151 |
A summary of the intangible asset account activity is as follows:
| Year Ended December 31,
| 2017 |  | 2016
| (in thousands)
Beginning balance, intangible assets, gross | $ | 669,896 |  |  | $ | 702,507 |
Intangible assets acquired | 36,500 |  |  | — |
Effect of change in exchange rates | 63,455 |  |  | (32,611 | )
Ending balance, intangible assets, gross | $ | 769,851 |  |  | $ | 669,896 |
A summary of intangible asset amortization expense is as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Amortization expense | $ | 20,785 |  |  | $ | 25,112 |  |  | $ | 31,673 |
Estimated future annual amortization expense is as follows:
Year Ending December 31, |  | Estimated Annual Amortization
|  | (in thousands)
2018 |  | $ | 19,380 |
2019 |  | 16,553 |
2020 |  | 14,208 |
2021 |  | 12,162 |
2022 |  | 9,961 |
Beyond 2022 |  | 22,964 |
Total intangible assets subject to amortization |  | $ | 95,228 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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- References No definition available. + Details
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