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Balance Sheet Components - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Mar. 06, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets | $ 11,177 |  | $ 21,851
Non-current regulatory assets | 752,090 |  | 670,802
Regulatory liabilities | 49,629 |  | 51,715
Non-current regulatory liabilities | 778,826 |  | 775,436
Income Tax Related |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory liabilities | 13,335 |  | 23,803
Non-current regulatory liabilities | 400,564 |  | 407,549
Natural Gas Deferrals [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory liabilities | 2,778 |  | 3,189
Non-current regulatory liabilities | 0 |  | 0
Power Deferrals Regulatory Liability [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory liabilities | 21,692 |  | 14,155
Non-current regulatory liabilities | 20,112 |  | 23,544
Decoupling surcharge |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory liabilities | 796 |  | 255
Non-current regulatory liabilities | 3,359 |  | 2,398
Provision for Rate Refunds [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory liabilities | 7,339 | $ 8,500 | 3,565
Non-current regulatory liabilities | 0 |  | 0
Removal Costs [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory liabilities | 0 |  | 0
Non-current regulatory liabilities | 322,138 |  | 312,403
Interest rate swaps |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory liabilities | 0 |  | 0
Non-current regulatory liabilities | 15,773 |  | 17,088
Other Regulatory Assets (Liabilities) [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory liabilities | 3,689 |  | 6,748
Non-current regulatory liabilities | 16,880 |  | 12,454
Energy commodity derivatives |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets | 309 |  | 6,310
Non-current regulatory assets | 0 |  | 264
Decoupling surcharge |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets | 10,345 |  | 12,098
Non-current regulatory assets | 18,514 |  | 14,806
Pension and other postretirement benefit plans |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets | 0 |  | 0
Non-current regulatory assets | 203,471 |  | 208,754
Interest rate swaps |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets | 0 |  | 0
Non-current regulatory assets | 244,672 |  | 168,594
Income Tax Related |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets | 0 |  | 0
Non-current regulatory assets | 98,879 |  | 95,752
Settlement with Coeur d'Alene Tribe |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets | 0 |  | 0
Non-current regulatory assets | 40,677 |  | 41,332
AFUDC above FERC allowed rate |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets | 0 |  | 0
Non-current regulatory assets | 41,912 |  | 40,749
Demand side management programs |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets | 0 |  | 0
Non-current regulatory assets | 6,538 |  | 12,170
Utility plant to be abandoned |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets | 0 |  | 0
Non-current regulatory assets | 30,700 |  | 31,291
Other Regulatory Assets (Liabilities) [Member] |  |  |
Regulated Asset Liability [Line Items] |  |  |
Regulatory assets | 523 |  | 3,443
Non-current regulatory assets | $ 66,727 |  | $ 57,090

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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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