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Regulatory Matters: Regulatory Matters (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Regulatory assets	$ 561,869	$ 652,981
Regulatory assets, current	(214,838)	(260,312)
Regulatory assets, non-current	347,031	392,669
Regulatory liabilities	577,061	518,573
Regulatory liabilities, current	(110,100)	(46,013)
Regulatory liabilities, non-current	466,961	472,560
Deferred energy and gas costs
Regulatory liabilities	106,030	41,722
Employee benefit plan costs and related deferred taxes
Regulatory liabilities	33,839	34,258
Cost of removal
Regulatory liabilities	177,453	175,614
Excess deferred income taxes
Regulatory liabilities	248,126	254,833
Other regulatory liabilities
Regulatory liabilities	11,613	12,146
Storm Costs
Regulatory assets	253,835	347,980
Deferred energy and gas costs
Regulatory assets	79,020	72,580
Deferred gas cost adjustments
Regulatory assets	16,047	12,147
Gas price derivatives
Regulatory assets	0	8,793
Regulatory liabilities	100
Deferred taxes on AFUDC
Regulatory assets	7,482	7,333
Employee benefit plans and related deferred taxes
Regulatory assets	88,710	89,259
Environmental
Regulatory assets	1,341	1,343
Loss on reacquired debt
Regulatory assets	18,764	19,213
Deferred taxes on flow through accounting
Regulatory assets	74,022	69,529
Decommissioning costs
Regulatory assets	2,850	3,472
Other regulatory assets
Regulatory assets	$ 19,798	$ 21,332

X

- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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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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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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