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Supplemental Financial Information (Severance and Related Benefits Activity) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Reserve [Roll Forward] |  |  |
Provisions | $ 12,348 | $ 948 | $ 2,532
Severance and Related Benefits |  |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance as of December 31, 2019 | 0 |  |
Provisions | 11,451 |  |
Payments | (819) |  |
Foreign currency translation adjustment | 371 |  |
Balance as of December 31, 2020 | $ 11,003 | $ 0 |

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