Income Taxes	9 Months Ended
Sep. 30, 2018
Income Taxes
Income Taxes	9. Income Taxes The 2017 Tax Act reduced the federal statutory income tax rate on corporations from 35% to 21% beginning in 2018. The Company has estimated that its effective income tax rate for 2018 will be 9.8%. The primary reasons for the effective income tax rate being below the federal statutory rate is due to research and development tax credits associated with the ongoing construction of the St. Clair kiln project and statutory depletion, which is allowed for income tax purposes and is a permanent difference between net income for financial reporting purposes and taxable income.

Income Taxes

9 Months Ended

Sep. 30, 2018

9. Income Taxes

The 2017 Tax Act reduced the federal statutory income tax rate on corporations from 35% to 21% beginning in 2018. The Company has estimated that its effective income tax rate for 2018 will be 9.8%. The primary reasons for the effective income tax rate being below the federal statutory rate is due to research and development tax credits associated with the ongoing construction of the St. Clair kiln project and statutory depletion, which is allowed for income tax purposes and is a permanent difference between net income for financial reporting purposes and taxable income.