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Income taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Effective tax rate	(14.80%)	(0.20%)	(2.90%)	25.60%
Effective income tax rate impact of discrete items	$ 0	$ 11,400,000
Unusual or Infrequent Item, or Both [Line Items]
Income tax provision (expense) benefit	(301,000)	$ (38,000)	$ (355,000)	$ 11,239,000
Tax benefit recognized with respect to net operating loss	$ 0
CARES Act
Unusual or Infrequent Item, or Both [Line Items]
Income tax provision (expense) benefit				11,300,000
Federal tax refund				$ 11,300,000

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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