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Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Regulated Asset Liability [Line Items]
Regulatory assets	$ 41,566	$ 48,552
Regulatory Assets, Noncurrent	605,497	614,354
Regulatory liabilities	55,464	113,209
Non-current regulatory liabilities	786,233	780,701
Income Tax Related
Regulated Asset Liability [Line Items]
Regulatory liabilities	29,401	27,997
Non-current regulatory liabilities	421,216	425,613
Natural Gas Deferrals [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	1,253	40,713
Non-current regulatory liabilities	0	0
Power Deferrals Regulatory Liability [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	12,555	25,072
Non-current regulatory liabilities	26,106	16,933
Decoupling surcharge
Regulated Asset Liability [Line Items]
Regulatory liabilities	1,061	6,782
Non-current regulatory liabilities	4,664	204
Removal Costs [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	0	0
Non-current regulatory liabilities	300,373	297,379
Interest rate swaps
Regulated Asset Liability [Line Items]
Regulatory liabilities	0	0
Non-current regulatory liabilities	20,396	28,078
Other Regulatory Assets (Liabilities) [Member]
Regulated Asset Liability [Line Items]
Regulatory liabilities	11,194	12,645
Non-current regulatory liabilities	13,478	12,494
Energy commodity derivatives
Regulated Asset Liability [Line Items]
Regulatory assets	28,159	41,428
Regulatory Assets, Noncurrent	11,862	16,866
Decoupling surcharge
Regulated Asset Liability [Line Items]
Regulatory assets	6,782	3,408
Regulatory Assets, Noncurrent	8,395	17,501
Pension and other postretirement benefit plans
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Regulatory Assets, Noncurrent	224,805	228,062
Interest rate swaps
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Regulatory Assets, Noncurrent	138,327	133,854
Income Tax Related
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Regulatory Assets, Noncurrent	93,646	91,188
Settlement with Coeur d'Alene Tribe
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Regulatory Assets, Noncurrent	42,316	42,643
Demand side management programs
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Regulatory Assets, Noncurrent	15,064	19,674
Utility plant to be abandoned
Regulated Asset Liability [Line Items]
Regulatory assets	0	0
Regulatory Assets, Noncurrent	24,477	24,334
Other Regulatory Assets (Liabilities) [Member]
Regulated Asset Liability [Line Items]
Regulatory assets	6,625	3,716
Regulatory Assets, Noncurrent	$ 46,605	$ 40,232

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Regulated Asset Liability [Line Items]

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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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-Publisher FASB
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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.

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