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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Income Tax Disclosure [Abstract] |  |  |  |
Federal income taxes at statutory rates | $ (1,185) | $ 1,876 | $ 13,764 | $ 22,173
Flow through related to deduction of meters and mixed service costs | 1,192 | (5,277) | (18,643) | (5,277)
Tax effect of regulatory treatment of utility plant differences | 420 | (1,697) | (6,878) | (8,748)
State income tax expense | (45) | 166 | 856 | 885
Settlement of equity awards |  |  | (19) | 909
Settlement of prior year tax returns | (318) | (400) | (318) | (400)
Other | 93 | (100) | (440) | (412)
Total income tax expense (benefit) | $ 157 | $ (5,432) | $ (11,678) | $ 9,130
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 | (21.10%) | (59.10%) | (28.40%) | (5.00%)
Tax effect of regulatory treatment of utility plant differences | (7.50%) | (19.00%) | (10.50%) | (8.30%)
State income tax expense | 0.80% | 1.90% | 1.30% | 0.80%
Settlement of equity awards |  |  |  | 0.90%
Settlement of prior year tax returns percent | 5.60% | (4.50%) | (0.50%) | (0.40%)
Other | (1.60%) | (1.10%) | (0.70%) | (0.40%)
Total income tax expense (benefit) | (2.80%) | (60.80%) | (17.80%) | 8.60%

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