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Income taxes (Tables)
6 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Provision for income taxes Provision for income taxes is based on the following:
For Three Months EndedFor Six Months Ended
June 30,June 30,
 2021202020212020
Taxes calculated using the estimated annual effective tax rate$322 $164 $597 $330 
Discrete tax items(11)(265)(100)(381)
Provision for income taxes$311 $(101)$497 $(51)
Effective tax rate14 %(8)%12 %(2)%