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Income taxes (Tables)
3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]  
Provision for income taxes
Provision for income taxes is based on the following:
For Three Months Ended
March 31,
 20212020
Taxes calculated using the estimated annual effective tax rate$275 $166 
Discrete tax items(89)(116)
Provision for income taxes$186 $50 
Effective tax rate10 %%