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Regulatory Matters: Regulatory Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Regulatory assets	$ 278,258	$ 271,344
Regulatory assets, current	(51,676)	(43,282)
Regulatory assets, non-current	226,582	228,062
Regulatory liabilities	532,720	536,652
Regulatory liabilities, current	(25,061)	(33,507)
Regulatory liabilities, non-current	507,659	503,145
Deferred energy and gas costs
Regulatory liabilities	13,253	17,278
Employee benefit plan costs and related deferred taxes
Regulatory liabilities	40,256	43,349
Cost of removal
Regulatory liabilities	172,902	166,727
Excess deferred income taxes
Regulatory liabilities	285,259	285,438
Other regulatory liabilities
Regulatory liabilities	21,050	23,860
Deferred energy and gas costs
Regulatory assets	39,035	34,088
Deferred gas cost adjustments
Regulatory assets	3,200	1,540
Gas price derivatives
Regulatory assets	2,226	3,328
Deferred taxes on AFUDC
Regulatory assets	7,491	7,790
Employee benefit plan costs and related deferred taxes
Regulatory assets	116,598	115,900
Environmental
Regulatory assets	1,413	1,454
Loss on reacquired debt
Regulatory assets	22,864	24,777
Renewable energy standard adjustment
Regulatory assets	0	1,622
Deferred taxes on flow through accounting
Regulatory assets	47,515	41,220
Decommissioning costs
Regulatory assets	8,988	10,670
Gas supply contract termination
Regulatory assets	2,524	8,485
Other regulatory assets
Regulatory assets	$ 26,404	$ 20,470

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- 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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