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Regulatory Matters (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Regulatory assets
Regulatory assets	$ 706,206	$ 796,599
Less current regulatory assets	(290,087)	(270,290)
Regulatory assets, non-current	416,119	526,309
Regulatory liabilities
Regulatory liabilities	494,760	502,951
Less current regulatory liabilities	(24,797)	(17,574)
Regulatory liabilities, non-current	469,963	485,377
Deferred energy and gas costs
Regulatory liabilities
Regulatory liabilities	6,283	6,113
Employee benefit plans and related deferred taxes
Regulatory liabilities
Regulatory liabilities	31,168	32,241
Cost of removal
Regulatory liabilities
Regulatory liabilities	174,312	179,976
Excess deferred income taxes
Regulatory liabilities
Regulatory liabilities	257,282	264,042
Other regulatory liabilities
Regulatory liabilities
Regulatory liabilities	25,715	20,579
Winter Storm Uri Incremental Costs in a Separately Tracked Mechanism
Regulatory assets
Regulatory assets	392,994	509,025
Deferred energy and gas costs
Regulatory assets
Regulatory assets	74,998	59,973
Deferred gas cost adjustments
Regulatory assets
Regulatory assets	18,764	9,488
Gas price derivatives
Regulatory assets
Regulatory assets	10,776	2,584
Deferred taxes on AFUDC
Regulatory assets
Regulatory assets	7,407	7,457
Employee benefit plans and related deferred taxes
Regulatory assets
Regulatory assets	86,335	88,923
Environmental
Regulatory assets
Regulatory assets	1,346	1,385
Loss on reacquired debt
Regulatory assets
Regulatory assets	19,663	21,011
Deferred taxes on flow through accounting
Regulatory assets
Regulatory assets	66,039	63,243
Decommissioning costs
Regulatory assets
Regulatory assets	4,094	5,961
Other regulatory assets
Regulatory assets
Regulatory assets	$ 23,790	$ 27,549

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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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