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Intangible Assets and Liabilities Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Accumulated (Amortization) Accretion | $ (826,760) | $ (794,717) |  |
Intangible assets, Net | 144,888 |  |  |
Intangible assets, Gross | 971,648 | 979,814 | $ 965,586 | $ 981,160
Intangible assets, Net | 144,888 | 185,097 |  |
Intangible liabilities, Gross | (23,900) | (23,900) | $ (23,900) | $ (23,900)
Intangible liabilities, Accumulated (Amortization) Accretion | 19,472 | 13,450 |  |
Intangible liabilities, Net | (4,428) | (10,450) |  |
Core-developed technology [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 509,222 | 507,669 |  |
Intangible assets, Accumulated (Amortization) Accretion | (476,689) | (458,109) |  |
Intangible assets, Net | 32,533 | 49,560 |  |
Customer contracts and relationships [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 372,539 | 381,288 |  |
Intangible assets, Accumulated (Amortization) Accretion | (264,075) | (251,509) |  |
Intangible assets, Net | 108,464 | 129,779 |  |
Trademarks and trade names [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 77,864 | 78,837 |  |
Intangible assets, Accumulated (Amortization) Accretion | (74,485) | (73,732) |  |
Intangible assets, Net | 3,379 | 5,105 |  |
Other Intangible Assets [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 12,023 | 12,020 |  |
Intangible assets, Accumulated (Amortization) Accretion | (11,511) | (11,367) |  |
Intangible assets, Net | $ 512 | $ 653 |  |

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