|6 Months Ended|
Jun. 30, 2021
|Income Tax Disclosure [Abstract]|
|Income Taxes||Income Taxes
The calculation of our effective tax rate is as follows for the three and six months ended June 30, 2021 and 2020 (in thousands, except percentages):
The effective tax rates were lower than the U.S. federal statutory rate of 21% primarily due to statutory depletion allowed on mineral royalty income.
The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.
Reference 1: http://www.xbrl.org/2003/role/disclosureRef