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Income Taxes
 6 Months Ended
Jun. 30, 2023
Income Tax Disclosure [Abstract]  
Income Taxes
Our interim effective tax rates reflect the estimated annual effective tax rates for 2023 and 2022 applied to year-to-date pretax income, adjusted for tax expense associated with certain discrete items. These adjustments have a relative impact on the effective tax rate proportionally to pretax income or loss. The effective tax rates for the three months ended June 30, 2023 and 2022 were 23.3% and 17.7%, respectively. The effective tax rates for the six months ended June 30, 2023 and 2022 were 20.6% and 18.2%, respectively. These effective tax rates differ from the federal statutory tax rate of 21% primarily due to renewable partnership income, amortization of excess deferred federal income tax liabilities, as specified in the TCJA, tax credits, state flow through, and other permanent book-to-tax differences.
The increase in the three month effective tax rate of 5.6% in 2023 compared to 2022 is primarily attributed to increases in renewable partnership income, partially offset by increased amortization of excess deferred federal income tax liabilities, current year impacts of a state legislative change in a flow-through jurisdiction, and restricted stock unit excess benefit.

The increase in the six month effective tax rate of 2.4% in 2023 compared to 2022 is primarily attributed to increases in renewable partnership income, partially offset by increased amortization of excess deferred federal income tax liabilities, current year impacts of a state legislative change in a flow-through jurisdiction, and restricted stock unit excess benefit.
As of June 30, 2023,