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Intangible Assets and Liabilities - Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | $ 979,814 | $ 981,160 | $ 769,851
Intangible assets, gross (excluding goodwill) | 979,814 | 981,160 |
Accumulated amortization | (794,717) | (723,577) |
Finite-lived intangible assets, Net | 185,097 | 257,583 |
Intangible assets, net | 185,097 | 257,583 |
Finite-lived intangible liabilities, gross | (23,900) | (23,900) | 0
Finite-lived intangible liabilities, accumulated accretion | 13,450 | 5,217 |
Finite-lived intangible liabilities, net | (10,450) | (18,683) |
Amortization of intangible assets | 64,286 | 71,713 | $ 20,785
Core-developed technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 507,669 | 507,100 |
Accumulated amortization | (458,109) | (429,955) |
Finite-lived intangible assets, Net | 49,560 | 77,145 |
Customer contracts and relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 381,288 | 379,614 |
Accumulated amortization | (251,509) | (212,538) |
Finite-lived intangible assets, Net | 129,779 | 167,076 |
Trademarks and Trade Names [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 78,837 | 78,746 |
Accumulated amortization | (73,732) | (69,879) |
Finite-lived intangible assets, Net | 5,105 | 8,867 |
Other [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 12,020 | 12,600 |
Accumulated amortization | (11,367) | (11,205) |
Finite-lived intangible assets, Net | 653 | 1,395 |
Finite-Lived Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 979,814 | 978,060 |
Accumulated amortization | (794,717) | (723,577) |
Finite-lived intangible assets, Net | 185,097 | 254,483 |
In Process Research and Development [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets (excluding goodwill) | $ 0 | $ 3,100 |

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