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Income Tax
9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Income Tax

11.    Income Tax

The effective income tax benefit rate for the current quarter and the prior year quarter was approximately 28% and 25%, respectively, resulting in an income tax benefit of $0.54 million and $0.15 million, respectively.

The effective income tax benefit rate for the current nine months and prior year nine months was approximately 26% and 10%, respectively, resulting in an income tax benefit of $2.02 million and $0.27 million, respectively.

For the current quarter, the federal statutory rate differed from the effective tax rate primarily due to state taxes, which increased the effective tax rate by approximately 7%.

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 12% and 18%, respectively, partially offset by the tax impact from the vesting of restricted shares of common stock, which was treated as a discrete item for tax purposes and decreased the effective rate by approximately 26%. The effective tax rate was also affected by the tax impact of a potential federal net operating loss carryback due to the CARES Act; this item increased the effective rate by approximately 3%.

For the current nine months, the federal statutory rate differed from the effective tax rate primarily due to state taxes, which increased the effective tax rate by approximately 7%, partially offset by the impact of recurring permanent differences, which decreased the effective tax rate by approximately 2%.

For the prior year nine months, the federal statutory rate differed from the effective tax rate primarily due to the tax impact from the vesting of restricted shares of common stock, which was treated as a discrete item for tax purposes and decreased the effective rate by approximately 5%. The effective rate was also attributable to state taxes and recurring permanent differences, which increased the effective tax rate by approximately 6% and decreased the effective tax rate by approximately 3%, respectively.