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Intangible Assets Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Intangible Assets [Line Items] |  |  |  |
Gross Assets | $ 686,064 | $ 669,896 | $ 708,981 | $ 702,507
Accumulated Amortization | (616,579) | (597,745) |  |
Total intangible assets subject to amortization | 69,485 | 72,151 |  |
Core-developed technology [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Gross Assets | 381,788 | 372,568 |  |
Accumulated Amortization | (365,766) | (354,878) |  |
Total intangible assets subject to amortization | 16,022 | 17,690 |  |
Customer contracts and relationships [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Gross Assets | 230,382 | 224,467 |  |
Accumulated Amortization | (176,960) | (170,056) |  |
Total intangible assets subject to amortization | 53,422 | 54,411 |  |
Trademarks and trade names [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Gross Assets | 62,817 | 61,785 |  |
Accumulated Amortization | (62,802) | (61,766) |  |
Total intangible assets subject to amortization | 15 | 19 |  |
Other [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Gross Assets | 11,077 | 11,076 |  |
Accumulated Amortization | (11,051) | (11,045) |  |
Total intangible assets subject to amortization | $ 26 | $ 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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