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Restructuring charges - Restructuring Liability (Details) - First quarter 2017 restructuring [Member] - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |
Other Restructuring Costs |  | $ (57) | $ 1,395 | $ 4,783
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring liability as of October 1, 2016 |  | 4,470 | 5,667 | 3,550
Restructuring charges |  | (57) | 1,395 | 4,783
Cash paid |  | (3,559) | (2,257) | (3,293)
Non-cash settlements |  |  | (335) | (627)
Restructuring liability as of December 31, 2017 |  | 854 | 4,470 | 5,667
Employee Severance [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance Costs | $ 10,300 | 0 | 0 | 0
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring liability as of October 1, 2016 |  | 0 | 0 | 0
Cash paid |  | 0 | 0 | 0
Non-cash settlements |  |  | 0 | 0
Restructuring liability as of December 31, 2017 |  | 0 | 0 | 0
Other Restructuring [Member] |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring liability as of October 1, 2016 |  | 4,470 | 5,667 | 3,550
Cash paid |  | (3,559) | (2,257) | (3,293)
Non-cash settlements |  |  | (335) | (627)
Restructuring liability as of December 31, 2017 |  | $ 854 | $ 4,470 | $ 5,667

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