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Intangible Assets and Liabilities Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Accumulated (Amortization) Accretion | $ (792,929) | $ (794,717) |  |
Intangible assets, Net | 170,810 |  |  |
Intangible assets, Gross | 963,739 | 979,814 | $ 983,519 | $ 981,160
Intangible assets, Net | 170,810 | 185,097 |  |
Intangible liabilities, Gross | (23,900) | (23,900) | $ (23,900) | $ (23,900)
Intangible liabilities, Accumulated (Amortization) Accretion | 15,458 | 13,450 |  |
Intangible liabilities, Net | (8,442) | (10,450) |  |
Core-developed technology [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 501,124 | 507,669 |  |
Intangible assets, Accumulated (Amortization) Accretion | (457,310) | (458,109) |  |
Intangible assets, Net | 43,814 | 49,560 |  |
Customer contracts and relationships [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 372,983 | 381,288 |  |
Intangible assets, Accumulated (Amortization) Accretion | (251,122) | (251,509) |  |
Intangible assets, Net | 121,861 | 129,779 |  |
Trademarks and trade names [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 77,613 | 78,837 |  |
Intangible assets, Accumulated (Amortization) Accretion | (73,083) | (73,732) |  |
Intangible assets, Net | 4,530 | 5,105 |  |
Other Intangible Assets [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 12,019 | 12,020 |  |
Intangible assets, Accumulated (Amortization) Accretion | (11,414) | (11,367) |  |
Intangible assets, Net | $ 605 | $ 653 |  |

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