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Accounting For Income Taxes (Schedule Of Deferred Income Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Valuation Allowance [Line Items] |  |
Unfunded benefit obligation | $ 43,224 | $ 45,842
Utility energy commodity and interest rate swap derivatives | 8,436 | 11,724
Regulatory deferred tax credits | 6,394 | 6,244
Tax credits | 21,696 | 21,008
Power and natural gas deferrals | 8,624 | 17,618
Deferred compensation | 7,171 | 5,536
Deferred taxes on regulatory liabilities | 101,648 | 106,909
Other | 17,423 | 16,793
Total gross deferred income tax assets | 214,616 | 231,674
Valuation allowances for deferred tax assets | (16,550) | (13,651)
Total gross deferred income tax assets | 198,066 | 218,023
Differences between book and tax basis of utility plant | 525,931 | 509,789
Regulatory asset on utility, property plant and equipment | 86,701 | 83,141
Regulatory asset for pensions and other postretirement benefits | 43,838 | 47,893
Utility energy commodity and interest rate swap derivatives | 8,436 | 11,724
Long-term debt and borrowing costs | 26,552 | 24,609
Settlement with Coeur d’Alene Tribe | 6,250 | 6,400
Other regulatory assets | 20,137 | 15,318
Other | 8,734 | 6,751
Total deferred income tax liabilities | 726,579 | 705,625
Total deferred income tax liabilities | 528,513 | $ 487,602
State Tax Credit Carryforward [Member] |  |
Valuation Allowance [Line Items] |  |
Tax Credit Carryforward, Amount | 22,300 |
Tax Credit Carryforwards, Net of Valuation Allowance | 6,000 |
Tax Credit Carryforward, Valuation Allowance | $ (16,300) |
Minimum [Member] | State Tax Credit Carryforward [Member] |  |
Valuation Allowance [Line Items] |  |
Tax Credit Carryforward, Expiration Date | 2020 |
Maximum [Member] | State Tax Credit Carryforward [Member] |  |
Valuation Allowance [Line Items] |  |
Tax Credit Carryforward, Expiration Date | 2033 |

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