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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Disclosure [Abstract] |  |  |  |
Federal income taxes at statutory rates | $ 1,876 | $ 1,204 | $ 22,173 | $ 15,167
Tax effect of regulatory treatment of utility plant differences | (3,277) | (2,427) | (9,721) | (7,244)
State income tax expense | 143 | (363) | 975 | 539
Non-plant excess deferred turnaround | 0 | 0 | 0 | (8,476)
Settlement of prior year tax returns | (400) | 524 | (400) | 1,565
Flow through related to deduction of meters and mixed service costs | (5,277) | 0 | (5,277) | 0
Settlement of equity awards | 0 | 0 | 909 | 165
Other | 1,503 | 1,921 | 471 | (244)
Total income tax expense (benefit) | $ (5,432) | $ 859 | $ 9,130 | $ 1,472
Federal income taxes at statutory rates | 21.00% | 21.00% | 21.00% | 21.00%
Tax effect of regulatory treatment of utility plant differences | (36.70%) | (42.30%) | (9.20%) | (10.00%)
State income tax expense | 1.60% | (6.30%) | 0.90% | 0.70%
Non-plant excess deferred turnaround | 0.00% | 0.00% | 0.00% | (11.80%)
Settlemet of prior year tax returns percent | (4.50%) | 9.10% | (0.40%) | 2.20%
Flow through related to deduction of meters and mixed service costs percent | (59.00%) | 0.00% | (5.00%) | 0.00%
Settlement of equity awards | 0.00% | 0.00% | 0.90% | 0.20%
Other | 16.80% | 33.50% | 0.40% | (0.30%)
Total income tax expense (benefit) | (60.80%) | 15.00% | 8.60% | 2.00%

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