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Accounting For Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended | 24 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Federal income taxes at statutory rates | $ 47,909 | $ 34,158 | $ 69,542 |
Federal income taxes at statutory rates | 21.00% | 21.00% | 35.00% | 21.00%
Tax effect of regulatory treatment of utility plant differences | $ (9,967) | $ (8,153) | $ 3,482 |
Tax effect of regulatory treatment of utility plant differences | (4.30%) | (5.00%) | 1.70% |
State income tax expense | $ 1,465 | $ 1,191 | $ 1,110 |
State income tax expense | 0.60% | 0.70% | 0.60% |
Settlement of prior year tax returns and adjustment of tax reserves | $ 643 | $ (140) | $ (384) |
Settlement of prior year tax returns and adjustment of tax reserves | 0.30% | (0.10%) | (0.20%) |
Manufacturing deduction | $ 0 | $ 0 | $ (1,119) |
Manufacturing deduction | 0.00% | 0.00% | (0.60%) |
Settlement of equity awards | $ 612 | $ (990) | $ (1,439) |
Settlement of equity awards | 0.30% | (0.60%) | (0.70%) |
Acquisition costs | $ (1,712) | $ 329 | $ 2,491 |
Acquisition costs | (0.70%) | 0.20% | 1.30% |
Federal income tax rate change | $ 0 | $ 0 | $ 10,169 |
Federal income tax rate change | 0.00% | 0.00% | 5.10% |
Non-plant excess deferred turnaround | $ (5,690) | $ 0 | $ 0 |
Non-plant excess deferred turnaround | (2.50%) | 0.00% | 0.00% |
Tax loss on sale of METALfx | $ (1,272) | $ 0 | $ 0 |
Tax loss on sale of METALfx | (0.60%) | 0.00% | 0.00% |
Valuation allowance | $ 267 | $ 0 | $ 0 |
Valuation allowance | 0.10% | 0.00% | 0.00% |
Other | $ (881) | $ (335) | $ (1,094) |
Other | (0.40%) | (0.20%) | (0.50%) |
Total income tax expense | $ 31,374 | $ 26,060 | $ 82,758 |
Effective Income Tax Rate Reconciliation, Percent | 13.80% | 16.00% | 41.70% |

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