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Intangible Assets and Liabilities Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Accumulated (Amortization) Accretion | $ (795,100) | $ (794,717) |  |
Intangible assets, Net | 157,125 |  |  |
Intangible assets, Gross | 952,225 | 979,814 | $ 985,509 | $ 981,160
Intangible assets, Net | 157,125 | 185,097 |  |
Intangible liabilities, Gross | (23,900) | (23,900) | $ (23,900) | $ (23,900)
Intangible liabilities, Accumulated (Amortization) Accretion | 17,465 | 13,450 |  |
Intangible liabilities, Net | (6,435) | (10,450) |  |
Core-developed technology [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 498,006 | 507,669 |  |
Intangible assets, Accumulated (Amortization) Accretion | (459,876) | (458,109) |  |
Intangible assets, Net | 38,130 | 49,560 |  |
Customer contracts and relationships [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 365,567 | 381,288 |  |
Intangible assets, Accumulated (Amortization) Accretion | (251,085) | (251,509) |  |
Intangible assets, Net | 114,482 | 129,779 |  |
Trademarks and trade names [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 76,631 | 78,837 |  |
Intangible assets, Accumulated (Amortization) Accretion | (72,677) | (73,732) |  |
Intangible assets, Net | 3,954 | 5,105 |  |
Other Intangible Assets [Member] |  |  |  |
Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross | 12,021 | 12,020 |  |
Intangible assets, Accumulated (Amortization) Accretion | (11,462) | (11,367) |  |
Intangible assets, Net | $ 559 | $ 653 |  |

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