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Accounting For Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Federal income taxes at statutory rates | $ 33,467 | $ 28,673 | $ 47,909 |  |
Tax effect of regulatory treatment of utility plant differences | (13,820) | (12,893) | (9,967) |  |
State income tax expense | 1,385 | 814 | 1,465 |  |
Acquisition costs |  |  | (1,712) |  |
Flow through related to deduction of meters and mixed service costs | (8,678) |  |  |  |
Non-plant excess deferred turnaround |  | (8,476) | (5,690) |  |
Tax loss on sale of METALfx |  |  | (1,272) |  |
Customer refunds related to prior years at 35 percent |  | (1,189) |  |  |
Other | (323) | 122 | 641 |  |
Total income tax expense | $ 12,031 | $ 7,051 | $ 31,374 |  |
Federal statutory tax rate | 21.00% | 21.00% | 21.00% | 21.00% | 35.00%
Tax effect of regulatory treatment of utility plant differences | (8.70%) | (9.40%) | (4.30%) |  |
State income tax expense | 0.80% | 0.60% | 0.60% |  |
Acquisition costs |  |  | (0.70%) |  |
Flow through related to deduction of meters and mixed service costs | (5.40%) |  |  |  |
Non-plant excess deferred turnaround |  | (6.20%) | (2.50%) |  |
Tax loss on sale of METALfx |  |  | (0.60%) |  |
Customer refunds related to prior years at 35 percent |  | (0.90%) |  |  |
Other | (0.20%) | 0.10% | 0.30% |  |
Effective Income Tax Rate Reconciliation, Percent | 7.50% | 5.20% | 13.80% |  |

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