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Intangible Assets Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | $ 769,851 | $ 669,896 | $ 702,507
Accumulated Amortization | (674,623) | (597,745) |
Net | 95,228 | 72,151 |
Core-developed technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 429,548 | 372,568 |
Accumulated Amortization | (399,969) | (354,878) |
Net | 29,579 | 17,690 |
Customer contracts and relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 258,586 | 224,467 |
Accumulated Amortization | (197,582) | (170,056) |
Net | 61,004 | 54,411 |
Trademarks and Trade Names [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 70,056 | 61,785 |
Accumulated Amortization | (66,004) | (61,766) |
Net | 4,052 | 19 |
Other [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Gross | 11,661 | 11,076 |
Accumulated Amortization | (11,068) | (11,045) |
Net | $ 593 | $ 31 |

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- Definition Accumulated amount of 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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- 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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