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Income Taxes (Details 1) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Federal statutory income tax rate |  |  | 21.00% | 34.00%
State income taxes, net of federal tax effect |  |  | 5.50% | 4.60%
Nondeductible/nontaxable items |  |  | 5.00% | 2.10%
Tax credits |  |  | (1.10%) | (0.90%)
Effective tax rate | 29.20% | 37.70% | 30.40% | 39.80%

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