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Balance Sheet Components - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets |  | $ 37,768 | $ 13,673
Non-current regulatory assets |  | 875,952 | 750,443
Regulatory liabilities |  | 75,559 | 46,435
Non-current regulatory liabilities |  | 886,351 | 784,820
Income Tax Related Liabilities [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory liabilities | [1] | 52,843 | 14,952
Non-current regulatory liabilities | [1] | 475,607 | 399,677
Power Deferrals Regulatory Liability [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory liabilities |  | 10,512 | 20,299
Non-current regulatory liabilities |  | 9,136 | 17,570
Decoupling Rebate [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory liabilities |  | 2,717 | 1,447
Non-current regulatory liabilities |  | 10,283 | 1,519
Removal Costs [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory liabilities |  | 0 | 0
Non-current regulatory liabilities |  | 344,061 | 325,832
Interest Rate Swaps [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory liabilities |  | 0 | 0
Non-current regulatory liabilities |  | 16,757 | 15,046
COVID-19 Deferrals [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory liabilities |  | 0 | 0
Non-current regulatory liabilities |  | 12,673 | 10,949
Other Regulatory Liabilities [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory liabilities |  | 9,487 | 9,737
Non-current regulatory liabilities |  | 17,834 | 14,227
Energy Commodity Derivatives [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets |  | 11,159 | 2,073
Non-current regulatory assets |  | 0 | 5,722
Decoupling Surcharge [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets |  | 9,036 | 7,123
Non-current regulatory assets |  | 12,641 | 17,123
Deferred Natural Gas Costs [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets |  | 9,967 | 2,308
Non-current regulatory assets |  | 4,758 | 0
Deferred Power Costs [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets |  | 7,606 | 1,775
Non-current regulatory assets |  | 4,043 | 1,562
Pension and Other Postretirement Benefit Plans [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets |  | 0 | 0
Non-current regulatory assets |  | 192,220 | 198,746
Interest Rate Swaps [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets |  | 0 | 0
Non-current regulatory assets |  | 195,909 | 214,851
Deferred Income Taxes [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets | [1] | 0 | 0
Non-current regulatory assets | [1] | 242,782 | 108,517
Settlement with Coeur d'Alene Tribe [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets |  | 0 | 0
Non-current regulatory assets |  | 39,205 | 40,043
AFUDC Above FERC Allowed Rate [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets |  | 0 | 0
Non-current regulatory assets |  | 45,093 | 47,393
Demand Side Management Programs [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets |  | 0 | 0
Non-current regulatory assets |  | 3,124 | 3,814
Utility Plant to be Abandoned [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets |  | 0 | 0
Non-current regulatory assets |  | 29,684 | 28,916
COVID-19 Deferrals [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets |  | 0 | 0
Non-current regulatory assets |  | 15,648 | 8,166
Other Regulatory Assets (Liabilities) [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets |  | 0 | 394
Non-current regulatory assets |  | $ 90,845 | $ 75,590
[1] | In 2021, the Company received regulatory approval in all jurisdictions to change to flow-through tax treatment of certain basis adjustments, which was $128.8 million as of September 30, 2021.

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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 http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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