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Restructuring and other related costs - Restructuring expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring and Related Activities [Abstract] |  |  |  |  |
Acceleration of rent expense | $ 16,106 |  | $ 0 |  |
Acceleration of depreciation expense | 5,377 |  | 0 |  |
Gain from extinguishment of lease liabilities | (1,866) |  | (7,733) |  |
Employee severance and related expenses | 600 |  | 0 |  |
Other costs, including other asset write-offs | 1,959 |  | 1,751 |  |
Total | $ 22,176 | $ 0 | $ (5,982) | $ 0 | $ 0

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