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Intangible Assets Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Intangible Assets [Line Items] |  |  |  |
Gross Assets | $ 763,326 | $ 669,896 |  | $ 702,507
Accumulated Amortization | (663,747) | (597,745) |  |
Intangible Assets, Net (Excluding Goodwill) | 100,289 | 72,151 |  |
Net Assets | 99,579 | 72,151 |  |
Intangible Assets, Gross (Excluding Goodwill) | 764,036 |  | $ 704,816 |
Core-developed technology [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Gross Assets | 425,198 | 372,568 |  |
Accumulated Amortization | (393,831) | (354,878) |  |
Net Assets | 31,367 | 17,690 |  |
Customer contracts and relationships [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Gross Assets | 256,840 | 224,467 |  |
Accumulated Amortization | (193,317) | (170,056) |  |
Net Assets | 63,523 | 54,411 |  |
Trademarks and trade names [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Gross Assets | 69,706 | 61,785 |  |
Accumulated Amortization | (65,537) | (61,766) |  |
Net Assets | 4,169 | 19 |  |
Other Intangible Assets [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Gross Assets | 11,582 | 11,076 |  |
Accumulated Amortization | (11,062) | (11,045) |  |
Net Assets | 520 | 31 |  |
In Process Research and Development [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Gross Assets | 710 | 0 |  |
Accumulated Amortization | 0 | 0 |  |
Net Assets | $ 710 | $ 0 |  |

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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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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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