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Income Taxes - Summary of Significant Factors Impact on Difference Between Effective Tax Rate and Federal Statutory Rate (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Income Tax Disclosure [Abstract] |  |  |  |
Federal income taxes at statutory rates | $ 2,294 | $ (1,185) | $ 14,872 | $ 13,764
Flow through related to deduction of meters and mixed service costs | (3,744) | 1,192 | (22,956) | (18,643)
Tax effect of regulatory treatment of utility plant differences | (828) | 420 | (6,040) | (6,878)
State income tax expense | 151 | (45) | 949 | 856
Tax credits | (862) |  | (1,997) |
Settlement of prior year tax returns | (867) | (318) | (867) | (318)
Uncertain tax positions | 184 |  | 184 |
Other | (114) | 93 | (369) | (459)
Total income tax benefit | $ (3,786) | $ 157 | $ (16,224) | $ (11,678)
Federal income taxes at statutory rates | 21.00% | 21.00% | 21.00% | 21.00%
Flow through related to deduction of meters and mixed service costs | (34.30%) | (21.10%) | (32.40%) | (28.40%)
Tax effect of regulatory treatment of utility plant differences | (7.60%) | (7.50%) | (8.50%) | (10.50%)
State income tax expense | 1.40% | 0.80% | 1.30% | 1.30%
Tax credits | (7.90%) |  | (2.80%) |
Settlement of prior year tax returns | (7.90%) | 5.60% | (1.20%) | (0.50%)
Uncertain tax positions | 1.70% |  | 0.20% |
Other | (1.00%) | (1.60%) | (0.50%) | (0.70%)
Total income tax benefit | (34.60%) | (2.80%) | (22.90%) | (17.80%)

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