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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