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Income Taxes
3 Months Ended
Mar. 31, 2020
Income Tax Disclosure [Abstract]  
Income Taxes
NOTE 17 — Income Taxes
The effective tax rates for the three-month periods ended March 31, 2020 and 2019 are as follows:
 
Three Months Ended
 
March 31,
 
March 31,
 
2020
 
2019
Effective tax rate
36.4
%
 
20.0
%

 
Our effective income tax rate was 36.4% and 20.0% in the first quarters of 2020 and 2019, respectively. This increase is primarily attributed to establishment of valuation allowances on certain U.S. tax credits and a one-time tax expense resulting from a change in company structure during 2020. The first quarter 2020 tax rate was higher than the U.S. statutory federal tax rate for the same reasons noted above. The first quarter 2019 tax rate was lower than the U.S. statutory federal tax rate primarily due to the tax benefits recorded upon vesting of restricted stock units.