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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Income Tax Disclosure [Abstract] |  |  |  |
Federal income taxes at statutory rates | $ 4,904 | $ 2,452 | $ 20,402 | $ 12,577
Flow through related to deduction of meters and mixed service costs | (2,898) | (5,689) | (11,683) | (19,212)
Tax effect of regulatory treatment of utility plant differences | (1,463) | (1,525) | (5,974) | (5,212)
State income tax expense | 179 | 232 | 718 | 798
Tax credits | (94) | (1,135) | (400) | (1,135)
Other | (133) | (145) | (262) | (254)
Total income tax expense (benefit) | $ 495 | $ (5,810) | $ 2,801 | $ (12,438)
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 | (12.40%) | (48.70%) | (12.00%) | (32.10%)
Tax effect of regulatory treatment of utility plant differences | (6.30%) | (13.10%) | (6.10%) | (8.70%)
State income tax expense | 0.80% | 2.00% | 0.70% | 1.30%
Tax credits | (0.40%) | (9.70%) | (0.40%) | (1.90%)
Other | (0.60%) | (1.30%) | (0.30%) | (0.40%)
Total income tax benefit | 2.10% | (49.80%) | 2.90% | (20.80%)

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