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Intangible Assets and Liabilities - Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | $ 978,060 | $ 769,851 | $ 669,896
Intangible assets, gross (excluding goodwill) | 981,160 | 769,851 |
Accumulated amortization | (723,577) | (674,623) |
Finite-lived intangible assets, Net | 254,483 | 95,228 |
Intangible assets, net | 257,583 | 95,228 |
Finite-lived intangible liabilities, gross | (23,900) | 0 | $ 0
Finite-lived intangible liabilities, accumulated accretion | 5,217 | 0 |
Finite-lived intangible liabilities, net | (18,683) | 0 |
Core-developed technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 507,100 | 429,548 |
Accumulated amortization | (429,955) | (399,969) |
Finite-lived intangible assets, Net | 77,145 | 29,579 |
Customer contracts and relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 379,614 | 258,586 |
Accumulated amortization | (212,538) | (197,582) |
Finite-lived intangible assets, Net | 167,076 | 61,004 |
Trademarks and Trade Names [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 78,746 | 70,056 |
Accumulated amortization | (69,879) | (66,004) |
Finite-lived intangible assets, Net | 8,867 | 4,052 |
Other [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 12,600 | 11,661 |
Accumulated amortization | (11,205) | (11,068) |
Finite-lived intangible assets, Net | 1,395 | 593 |
In Process Research and Development [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets (excluding goodwill) | $ 3,100 | $ 0 |

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