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Intangible Assets and Liabilities Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | $ 985,509 | $ 978,060 |  |
Intangible assets, Accumulated (Amortization) Accretion | (763,742) | (723,577) |  |
Intangible assets, Net | 221,767 | 254,483 |  |
Intangible assets, Gross | 985,509 | 981,160 | $ 992,507 | $ 769,851
Intangible assets, Net | 221,767 | 257,583 |  |
Intangible liabilities, Gross | (23,900) | (23,900) | $ (23,900) | $ 0
Intangible liabilities, Accumulated (Amortization) Accretion | 9,333 | 5,217 |  |
Intangible liabilities, Net | (14,567) | (18,683) |  |
Core-developed technology [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 511,967 | 507,100 |  |
Intangible assets, Accumulated (Amortization) Accretion | (446,653) | (429,955) |  |
Intangible assets, Net | 65,314 | 77,145 |  |
Customer contracts and relationships [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 382,397 | 379,614 |  |
Intangible assets, Accumulated (Amortization) Accretion | (233,664) | (212,538) |  |
Intangible assets, Net | 148,733 | 167,076 |  |
Trademarks and trade names [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 79,123 | 78,746 |  |
Intangible assets, Accumulated (Amortization) Accretion | (72,138) | (69,879) |  |
Intangible assets, Net | 6,985 | 8,867 |  |
Other Intangible Assets [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 12,022 | 12,600 |  |
Intangible assets, Accumulated (Amortization) Accretion | (11,287) | (11,205) |  |
Intangible assets, Net | 735 | 1,395 |  |
In Process Research and Development [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 0 | 3,100 |  |
Intangible assets, Accumulated (Amortization) Accretion | 0 | 0 |  |
Intangible assets, Net | $ 0 | $ 3,100 |  |

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