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Income Tax
3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]  
Income Tax

9.    Income Tax

The effective income tax rate for the current quarter and the prior year quarter was approximately 5% and 40%,  respectively, resulting in an income tax benefit provision of $0.14 million and $0.55 million, respectively.

For the current quarter, the federal statutory rate differed from the effective tax rate primarily due to recurring permanent differences, which decreased the effective tax rate by approximately 17%, partially offset by state taxes, which increased the effective tax rate by approximately 1%.

For the prior year quarter, the federal statutory rate differed from the effective tax rate primarily due to state taxes and recurring permanent differences, which increased the effective tax rate by approximately 8% and 4%, respectively. The effective tax rate was also attributable to the tax impact of a potential federal net operating loss carryback due to the CARES Act.  This item increased the effective rate by 7%.