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Balance Sheet Components - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Regulated Asset Liability [Line Items]
Regulatory assets	$ 29,225	$ 13,673
Non-current regulatory assets	705,921	750,443
Regulatory liabilities	45,067	46,435
Non-current regulatory liabilities	783,784	784,820
Deferred Income Tax Charge [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	15,013	14,952
Non-current regulatory liabilities	395,859	399,677
Power Deferrals Regulatory Liability [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	18,955	20,299
Non-current regulatory liabilities	13,859	17,570
Decoupling Surcharge [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	1,396	1,447
Non-current regulatory liabilities	1,604	1,519
Removal Costs [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	0	0
Non-current regulatory liabilities	330,897	325,832
Interest Rate Swaps [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	0	0
Non-current regulatory liabilities	17,218	15,046
COVID-19 Deferrals [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	0	0
Non-current regulatory liabilities	11,628	10,949
Other Regulatory Assets (Liabilities) [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	9,703	9,737
Non-current regulatory liabilities	12,719	14,227
Energy commodity derivatives
Regulated Asset Liability [Line Items]
Regulatory assets	3,637	2,073
Non-current regulatory assets	3,237	5,722
Decoupling Surcharge [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	18,150	7,123
Non-current regulatory assets	6,812	17,123
Pension and Other Postretirement Benefit Plans [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Non-current regulatory assets	196,153	198,746
Interest Rate Swaps [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Non-current regulatory assets	177,824	214,851
Deferred Income Tax Charge [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Non-current regulatory assets	111,537	108,517
Settlement with Coeur d'Alene Tribe [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Non-current regulatory assets	39,764	40,043
AFUDC Above FERC Allowed Rate [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Non-current regulatory assets	48,270	47,393
Demand Side Management Programs [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Non-current regulatory assets	904	3,814
Utility Plant to be Abandoned [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Non-current regulatory assets	27,599	28,916
COVID-19 Deferrals [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Non-current regulatory assets	11,759	8,166
Other Regulatory Assets (Liabilities) [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	7,438	4,477
Non-current regulatory assets	$ 82,062	$ 77,152

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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.

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