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Balance Sheet Components - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Regulated Asset Liability [Line Items] |  |
Regulatory assets | $ 59,573 | $ 43,783
Non-current regulatory assets | 836,538 | 860,626
Regulatory liabilities | 98,081 | 77,149
Non-current regulatory liabilities | 845,495 | 861,515
Income Tax Related Liabilities [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory liabilities | 77,689 | 56,331
Non-current regulatory liabilities | 402,464 | 458,789
Deferred Power Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory liabilities | 0 | 6,457
Non-current regulatory liabilities | 2,287 | 5,434
Decoupling Rebate [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory liabilities | 7,504 | 3,049
Non-current regulatory liabilities | 17,748 | 6,259
Utility Plant Retirement Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory liabilities | 0 | 0
Non-current regulatory liabilities | 370,232 | 350,190
Interest Rate Swaps [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory liabilities | 0 | 0
Non-current regulatory liabilities | 23,556 | 15,062
COVID-19 Deferrals [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory liabilities | 0 | 0
Non-current regulatory liabilities | 12,032 | 12,500
Other Regulatory Liabilities [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory liabilities | 12,888 | 11,312
Non-current regulatory liabilities | 17,176 | 13,281
Energy Commodity Derivatives [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets | 8,374 | 12,447
Non-current regulatory assets | 4,201 | 2,938
Decoupling Surcharge [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets | 6,674 | 9,907
Non-current regulatory assets | 5,346 | 14,625
Deferred Natural Gas Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets | 38,674 | 14,095
Non-current regulatory assets | 0 | 6,932
Deferred Power Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets | 4,413 | 7,334
Non-current regulatory assets | 0 | 3,501
Deferred Income Taxes [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets | 0 | 0
Non-current regulatory assets | 251,033 | 244,154
Pension and Other Postretirement Benefit Plans [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets | 0 | 0
Non-current regulatory assets | 161,665 | 165,696
Interest Rate Swaps [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets | 0 | 0
Non-current regulatory assets | 187,607 | 199,754
AFUDC Above FERC Allowed Rate [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets | 0 | 0
Non-current regulatory assets | 50,956 | 48,455
Settlement with Coeur d'Alene Tribe [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets | 0 | 0
Non-current regulatory assets | 38,088 | 38,926
Advanced Meter Infrastructure [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets | 0 | 0
Non-current regulatory assets | 33,288 | 36,008
Utility Plant Abandoned [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets | 0 | 0
Non-current regulatory assets | 24,937 | 26,771
COVID-19 Deferrals [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets | 0 | 0
Non-current regulatory assets | 13,497 | 13,591
Unamortized Debt Repurchase Costs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets | 0 | 0
Non-current regulatory assets | 6,305 | 6,768
Demand Side Management Programs [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets | 0 | 0
Non-current regulatory assets | 5,144 | 3,974
Other Regulatory Assets [Member] |  |
Regulated Asset Liability [Line Items] |  |
Regulatory assets | 1,438 | 0
Non-current regulatory assets | $ 54,471 | $ 48,533

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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