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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