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Income taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income taxes        
Effective income tax rate (as a percent) 6.20% 23.80% 27.20% 23.70%
Effect of net operating loss carryback charges related to CARES Act $ 108   $ (210)