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Restructuring charges - Narrative (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 14, 2020 | Mar. 15, 2017 | Mar. 31, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  | $ 25,396 | $ 1,454 | $ 22,743
Operating Lease, Impairment Loss |  |  |  | 12,460 | 0 | 0
First quarter 2017 restructuring [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected percent of positions eliminated |  | 17.00% |  |  |  |
Restructuring charges |  |  | $ 23,100 |  |  |
Other Restructuring Costs |  |  |  | (57) | 1,395 | 4,783
First quarter 2017 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  | 12,800 |  |  |
First quarter 2017 restructuring [Member] | Employee Severance and Pay Related Costs [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance Costs |  |  | $ 10,300 | 0 | $ 0 | $ 0
Second quarter 2020 restructuring [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected percent of positions eliminated | 20.00% |  |  |  |  |
Restructuring charges |  |  |  | 25,500 |  |
Other Restructuring Costs |  |  |  | 5,800 |  |
Second quarter 2020 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  | 5,800 |  |
Second quarter 2020 restructuring [Member] | Employee Severance and Pay Related Costs [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance Costs |  |  |  | $ 7,287 |  |

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