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Intangible Assets and Liabilities Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Accumulated (Amortization) Accretion | $ (875,165) | $ (867,082) |  |
Intangible assets, Net | 103,763 |  |  |
Intangible assets, Gross | 978,928 | 1,000,037 | $ 971,648 | $ 979,814
Intangible assets, Net | 103,763 | 132,955 |  |
Intangible liabilities, Gross | (23,900) | (23,900) | $ (23,900) | $ (23,900)
Intangible liabilities, Accumulated (Amortization) Accretion | 22,950 | 21,479 |  |
Intangible liabilities, Net | (950) | (2,421) |  |
Core-developed technology [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 511,885 | 525,051 |  |
Intangible assets, Accumulated (Amortization) Accretion | (495,799) | (498,113) |  |
Intangible assets, Net | 16,086 | 26,938 |  |
Customer contracts and relationships [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 376,572 | 383,245 |  |
Intangible assets, Accumulated (Amortization) Accretion | (291,783) | (280,497) |  |
Intangible assets, Net | 84,789 | 102,748 |  |
Trademarks and trade names [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 78,448 | 79,716 |  |
Intangible assets, Accumulated (Amortization) Accretion | (75,933) | (76,912) |  |
Intangible assets, Net | 2,515 | 2,804 |  |
Other Intangible Assets [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 12,023 | 12,025 |  |
Intangible assets, Accumulated (Amortization) Accretion | (11,650) | (11,560) |  |
Intangible assets, Net | $ 373 | $ 465 |  |

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