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Income taxes (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Income Tax Disclosure [Abstract] |  |  |  |
Effective tax rate | 0.30% | (0.30%) | (0.50%) | 45.90%
Effective income tax rate impact of discrete items | $ 0 | $ 11,400,000 |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |
Income tax provision benefit (expense) | 5,000 | $ (27,000) | $ (53,000) | $ 11,277,000
Tax benefit recognized with respect to net operating loss | 0 |  |  |
CARES Act |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |
Income tax provision benefit (expense) | $ 11,300,000 |  |  |
Federal tax refund |  |  | $ 1,200,000 |

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