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Intangible Assets and Liabilities Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Accumulated (Amortization) Accretion | $ (860,772) | $ (867,082) |  |
Intangible assets, Net | 122,861 |  |  |
Intangible assets, Gross | 983,633 | 1,000,037 | $ 963,739 | $ 979,814
Intangible assets, Net | 122,861 | 132,955 |  |
Intangible liabilities, Gross | (23,900) | (23,900) | $ (23,900) | $ (23,900)
Intangible liabilities, Accumulated (Amortization) Accretion | 21,969 | 21,479 |  |
Intangible liabilities, Net | (1,931) | (2,421) |  |
Core-developed technology [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 514,416 | 525,051 |  |
Intangible assets, Accumulated (Amortization) Accretion | (491,146) | (498,113) |  |
Intangible assets, Net | 23,270 | 26,938 |  |
Customer contracts and relationships [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 378,430 | 383,245 |  |
Intangible assets, Accumulated (Amortization) Accretion | (281,965) | (280,497) |  |
Intangible assets, Net | 96,465 | 102,748 |  |
Trademarks and trade names [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 78,763 | 79,716 |  |
Intangible assets, Accumulated (Amortization) Accretion | (76,055) | (76,912) |  |
Intangible assets, Net | 2,708 | 2,804 |  |
Other Intangible Assets [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 12,024 | 12,025 |  |
Intangible assets, Accumulated (Amortization) Accretion | (11,606) | (11,560) |  |
Intangible assets, Net | $ 418 | $ 465 |  |

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