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Balance Sheet Components - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | $ 167,927 | $ 193,787
Regulatory Assets, Non-Current | 855,099 | 833,328
Regulatory Liabilities, Current | 73,843 | 95,665
Regulatory Liabilities, Non-Current | 863,717 | 840,837
Income Tax Related Liabilities [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 41,680 | 73,267
Regulatory Liabilities, Non-Current | 357,812 | 390,734
Deferred Natural Gas Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 6,599 | 0
Regulatory Liabilities, Non-Current | 0 | 0
Deferred power costs |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Non-Current | 3,712 |
Decoupling Rebate [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 13,644 | 9,469
Regulatory Liabilities, Non-Current | 21,327 | 20,476
Utility Plant Retirement Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 0 | 0
Regulatory Liabilities, Non-Current | 411,250 | 376,817
Interest Rate Swaps [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 0 | 0
Regulatory Liabilities, Non-Current | 26,681 | 24,204
Deferred Climate Commitment Act Revenues [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Non-Current | 21,675 |
COVID-19 Deferrals [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 0 | 0
Regulatory Liabilities, Non-Current | 10,640 | 11,874
Other Regulatory Liabilities [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Liabilities, Current | 11,920 | 12,929
Regulatory Liabilities, Non-Current | 10,620 | 16,732
Energy Commodity Derivatives [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 45,144 | 112,090
Regulatory Assets, Non-Current | 13,715 | 18,185
Decoupling Surcharge [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 2,087 | 6,250
Regulatory Assets, Non-Current | 3,407 | 5,449
Deferred Natural Gas Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 84,851 | 52,091
Regulatory Assets, Non-Current | 0 | 0
Deferred Power Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 34,751 | 23,356
Regulatory Assets, Non-Current | 17,766 | 24,043
Deferred Income Taxes [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 242,498 | 240,325
Pension and Other Postretirement Benefit Plans [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 131,269 | 135,337
Interest Rate Swaps [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 181,050 | 185,919
AFUDC Above FERC Allowed Rate [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 49,778 | 51,649
Settlement with Coeur d'Alene Tribe [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 36,972 | 37,809
Advanced Meter Infrastructure [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 30,104 | 32,381
Utility Plant Abandoned [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 30,362 | 24,389
Deferred Climate Commitment Act Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 30,760 | 0
COVID-19 Deferrals [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 10,170 | 9,793
Unamortized Debt Repurchase Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 5,817 | 6,177
Demand Side Management Programs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | 2,728 | 3,683
Other Regulatory Assets [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory Assets, Current | 0 | 0
Regulatory Assets, Non-Current | $ 68,703 | $ 58,189

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
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