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Intangible Assets Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Intangible Assets [Line Items] |  |  |  |
Gross Assets | $ 1,025,830 | $ 769,851 |  | $ 669,896
Accumulated Amortization | (714,446) | (674,623) |  |
Net Assets | 311,384 | 95,228 |  |
Intangible Assets, Net (Excluding Goodwill) | 318,984 | 95,228 |  |
Intangible Assets, Gross (Excluding Goodwill) | 1,033,430 |  | $ 686,064 |
Finite-lived intangible liabilities, Gross | (23,900) | 0 | $ 0 | $ 0
Finite-Lived Intangible Liabilities, Accumulated Accretion | 1,304 | 0 |  |
Finite-Lived Intangible Liabilities, Net | (22,596) | 0 |  |
Core-developed technology [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Gross Assets | 531,263 | 429,548 |  |
Accumulated Amortization | (423,634) | (399,969) |  |
Net Assets | 107,629 | 29,579 |  |
Customer contracts and relationships [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Gross Assets | 400,566 | 258,586 |  |
Accumulated Amortization | (210,757) | (197,582) |  |
Net Assets | 189,809 | 61,004 |  |
Trademarks and trade names [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Gross Assets | 82,337 | 70,056 |  |
Accumulated Amortization | (68,982) | (66,004) |  |
Net Assets | 13,355 | 4,052 |  |
Other Intangible Assets [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Gross Assets | 11,664 | 11,661 |  |
Accumulated Amortization | (11,073) | (11,068) |  |
Net Assets | 591 | 593 |  |
In Process Research and Development [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Gross Assets | 7,600 | 0 |  |
Accumulated Amortization | 0 | 0 |  |
Net Assets | $ 7,600 | $ 0 |  |

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