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Income Taxes Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Effective Tax Rate Reconciliation [Line Items] |  |  |  |  |
Regulatory liabilities | $ 37,954 |  | $ 37,954 |  | $ 113,209
Federal income taxes at statutory rates | $ 4,874 | $ 6,479 | $ 35,513 | $ 20,269 |
Federal income taxes at statutory rates | 21.00% | 21.00% | 21.00% | 21.00% |
Tax effect of regulatory treatment of utility plant differences | $ (2,139) | $ (1,981) | $ (4,219) | $ (2,999) |
Tax effect of regulatory treatment of utility plant differences | (9.20%) | (6.40%) | (2.50%) | (3.10%) |
State income tax expense | $ (8) | $ 60 | $ 1,651 | $ 1,024 |
State income tax expense | 0.00% | 0.20% | 1.00% | 1.10% |
Acquisition costs | $ 112 | $ 73 | $ (1,712) | $ 119 |
Acquisition costs | 0.50% | 0.20% | (1.00%) | 0.10% |
Non-plant excess deferred turnaround (1) | $ (5,091) | $ (11) | $ (5,601) | $ (11) |
Non-plant excess deferred turnaround (1) | (21.90%) | 0.00% | (3.30%) | 0.00% |
Tax loss on sale of METALfx | $ (1,259) | $ 0 | $ (1,259) | $ 0 |
Tax loss on sale of METALfx | (5.40%) | 0.00% | (0.80%) | 0.00% |
Valuation allowance | $ 1,245 | $ 0 | $ 1,245 | $ 0 |
Valuation allowance | 5.30% | 0.00% | 0.70% | 0.00% |
Settlement of equity awards | $ 0 | $ 0 | $ 612 | $ (990) |
Settlement of equity awards | 0.00% | 0.00% | 0.40% | (1.00%) |
Other | $ 525 | $ 589 | $ 2,046 | $ (1,493) |
Other | 2.20% | 1.90% | 1.20% | (1.60%) |
Income Tax Expense (Benefit) | $ (1,741) | $ 5,209 | $ 28,276 | $ 15,919 |
Effective Income Tax Rate | (7.50%) | 16.90% | 16.70% | 16.50% |
Income Tax Related |  |  |  |  |
Effective Tax Rate Reconciliation [Line Items] |  |  |  |  |
Regulatory liabilities | $ 23,079 |  | $ 23,079 |  | $ 27,997
Income Tax Related | IDAHO |  |  |  |  |
Effective Tax Rate Reconciliation [Line Items] |  |  |  |  |
Regulatory liabilities | $ 6,400 |  | $ 6,400 |  |

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