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Asset Retirement Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	$ 71,431	$ 64,205
Liabilities Incurred	0	5,999
Liabilities Settled	(1,044)	(317)
Accretion	3,048	2,769
Revisions to Prior Estimates	2,109	(1,225)
Ending Balance	75,544	71,431
Electric Utilities
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	29,157	28,120
Liabilities Incurred	0	1,217
Liabilities Settled	(978)	(185)
Accretion	1,315	1,230
Revisions to Prior Estimates	595	(1,225)
Ending Balance	30,089	29,157
Gas Utilities
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning Balance	42,274	36,085
Liabilities Incurred	0	4,782
Liabilities Settled	(66)	(132)
Accretion	1,733	1,539
Revisions to Prior Estimates	1,514	0
Ending Balance	$ 45,455	$ 42,274

X

- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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Amount of asset retirement obligations incurred during the period.

+ References

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-Topic 410
-SubTopic 20
-Section 50
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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

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-Topic 410
-SubTopic 20
-Section 50
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- Definition

Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 35
-Paragraph 8
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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