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Intangible Assets Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | $ 669,896 | $ 702,507 | $ 748,148
Accumulated Amortization | (597,745) | (600,575) |
Net | 72,151 | 101,932 |
Core-developed technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 372,568 | 388,981 |
Accumulated Amortization | (354,878) | (358,092) |
Net | 17,690 | 30,889 |
Customer contracts and relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 224,467 | 238,379 |
Accumulated Amortization | (170,056) | (168,885) |
Net | 54,411 | 69,494 |
Trademarks and Trade Names [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 61,785 | 64,069 |
Accumulated Amortization | (61,766) | (62,571) |
Net | 19 | 1,498 |
Other [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 11,076 | 11,078 |
Accumulated Amortization | (11,045) | (11,027) |
Net | $ 31 | $ 51 |

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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