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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 | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Income Tax Disclosure [Abstract] |  |  |  |
Federal income taxes at statutory rates | $ 2,195 | $ 3,459 | $ 14,948 | $ 20,297
Flow through related to deduction of meters and mixed service costs | (2,401) |  | (19,835) |
Tax effect of regulatory treatment of utility plant differences | (976) | (1,085) | (7,298) | (7,051)
State income tax expense | 78 | 241 | 901 | 719
Settlement of equity awards |  | (21) | (19) | 909
Other | 105 | (196) | (532) | (312)
Total income tax expense (benefit) | $ (999) | $ 2,398 | $ (11,835) | $ 14,562
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 | (23.00%) |  | (27.90%) |
Tax effect of regulatory treatment of utility plant differences | (9.30%) | (6.60%) | (10.30%) | (7.30%)
State income tax expense | 0.70% | 1.50% | 1.30% | 0.70%
Settlement of equity awards |  | (0.10%) |  | 1.00%
Other | 1.00% | (1.20%) | (0.70%) | (0.30%)
Total income tax expense (benefit) | (9.60%) | 14.60% | (16.60%) | 15.10%

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