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Intangible Assets and Liabilities Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | $ 993,438 | $ 769,851 |  |
Intangible assets, Accumulated (Amortization) Accretion | (718,346) | (674,623) |  |
Intangible assets, Net | 275,092 | 95,228 |  |
Intangible assets, Gross | 996,538 | 769,851 | $ 764,036 | $ 669,896
Intangible assets, Net | 278,192 | 95,228 |  |
Intangible liabilities, Gross | (23,900) | 0 | $ 0 | $ 0
Intangible liabilities, Accumulated (Amortization) Accretion | 3,913 | 0 |  |
Intangible liabilities, Net | (19,987) | 0 |  |
Core-developed technology [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 515,949 | 429,548 |  |
Intangible assets, Accumulated (Amortization) Accretion | (427,069) | (399,969) |  |
Intangible assets, Net | 88,880 | 29,579 |  |
Customer contracts and relationships [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 385,148 | 258,586 |  |
Intangible assets, Accumulated (Amortization) Accretion | (210,735) | (197,582) |  |
Intangible assets, Net | 174,413 | 61,004 |  |
Trademarks and trade names [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 79,739 | 70,056 |  |
Intangible assets, Accumulated (Amortization) Accretion | (69,376) | (66,004) |  |
Intangible assets, Net | 10,363 | 4,052 |  |
Other Intangible Assets [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 12,602 | 11,661 |  |
Intangible assets, Accumulated (Amortization) Accretion | (11,166) | (11,068) |  |
Intangible assets, Net | 1,436 | 593 |  |
In Process Research and Development [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 3,100 | 0 |  |
Intangible assets, Accumulated (Amortization) Accretion | 0 | 0 |  |
Intangible assets, Net | $ 3,100 | $ 0 |  |

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