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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Federal income taxes at statutory rates, amount | $ 2,002 | $ 4,874 | $ 13,963 | $ 35,513
Tax effect of regulatory treatment of utility plant differences, amount | (2,415) | (2,139) | (4,817) | (4,219)
State income tax expense, amount | (325) | (8) | 902 | 1,651
Acquisition costs, amount | 0 | 112 | 0 | (1,712)
Non-plant excess deferred turnaround, amount | (8,390) | (5,091) | (8,476) | (5,601)
Tax loss on sale of METALfx, amount | 0 | (1,259) | 0 | (1,259)
Valuation allowance, amount | 0 | 1,245 | 0 | 1,245
Settlement of equity awards, amount | 0 | 0 | 165 | 612
Other, amount | 1,209 | 525 | (1,124) | 2,046
Total income tax expense, amount | $ (7,919) | $ (1,741) | $ 613 | $ 28,276
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 | (25.30%) | (9.20%) | (7.20%) | (2.50%)
State income tax expense, percent | (3.40%) | 0.00% | 1.40% | 1.00%
Acquisition costs, percent | 0.00% | 0.50% | 0.00% | (1.00%)
Non-plant excess deferred turnaround, percent | (88.00%) | (21.90%) | (12.70%) | (3.30%)
Tax loss on sale of METALfx, percent | 0.00% | (5.40%) | 0.00% | (0.80%)
Valuation allowance, percent | 0.00% | 5.30% | 0.00% | 0.70%
Settlement of equity awards, percent | 0.00% | 0.00% | 0.10% | 0.40%
Other, percent | 12.70% | 2.20% | (1.70%) | 1.20%
Total income tax expense, percent | (83.00%) | (7.50%) | 0.90% | 16.70%

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