Income Taxes	3 Months Ended
Mar. 31, 2018
Income Taxes
Income Taxes	9. Income Taxes The 2017 Tax Act reduced the federal statutory rate on corporations from 35% to 21% beginning in 2018. The Company has estimated that its effective income tax rate for 2018 will be 11.7%. The primary reasons for the effective rate being below the federal statutory rate is due to statutory depletion, which is allowed for income tax purposes and is a permanent difference between net income for financial reporting purposes and taxable income, and income tax credits associated with the ongoing construction of the St. Clair kiln project.

Income Taxes

3 Months Ended

Mar. 31, 2018

9. Income Taxes

The 2017 Tax Act reduced the federal statutory rate on corporations from 35% to 21% beginning in 2018. The Company has estimated that its effective income tax rate for 2018 will be 11.7%. The primary reasons for the effective rate being below the federal statutory rate is due to statutory depletion, which is allowed for income tax purposes and is a permanent difference between net income for financial reporting purposes and taxable income, and income tax credits associated with the ongoing construction of the St. Clair kiln project.