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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Federal income taxes at statutory rates, amount | $ 1,204 | $ 1,041 | $ 15,167 | $ 36,554
Tax effect of regulatory treatment of utility plant differences, amount | (2,427) | (2,139) | (7,244) | (6,358)
State income tax expense, amount | (363) | (800) | 539 | 851
Settlement of prior year tax returns, amount | 524 | (604) | 1,565 | 1,995
Acquisition costs, amount | 0 | 0 | 0 | (1,712)
Non-plant excess deferred turnaround, amount | 0 | (20) | (8,476) | (5,621)
Tax loss on sale of METALfx, amount | 0 | (13) | 0 | (1,272)
Valuation allowance, amount | 0 | 0 | 0 | 1,245
Settlement of equity awards, amount | 0 | 0 | 165 | 612
Other, amount | 1,921 | 2,404 | (244) | 1,851
Total income tax expense, amount | $ 859 | $ (131) | $ 1,472 | $ 28,145
Federal income taxes at statutory rates, percent | 21.00% | 21.00% | 21.00% | 21.00%
Tax effect of regulatory treatment of utility plant differences, percent | (42.30%) | (43.10%) | (10.00%) | (3.70%)
State income tax expense, percent | (6.30%) | (16.10%) | 0.70% | 0.50%
Settlement of prior year tax returns, percent | 9.10% | (12.20%) | 2.20% | 1.10%
Acquisition costs, percent | 0.00% | 0.00% | 0.00% | (1.00%)
Non-plant excess deferred turnaround, percent | 0.00% | (0.40%) | (11.80%) | (3.20%)
Tax loss on sale of METALfx, percent | 0.00% | (0.20%) | 0.00% | (0.70%)
Valuation allowance, percent | 0.00% | 0.00% | 0.00% | 0.70%
Settlement of equity awards, percent | 0.00% | 0.00% | 0.20% | 0.40%
Other, percent | 33.50% | 48.40% | (0.30%) | 1.10%
Total income tax expense, percent | 15.00% | (2.60%) | 2.00% | 16.20%

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