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Subsequent Events (Details) - USD ($) $ in Thousands	Jan. 20, 2023	Dec. 31, 2022	Dec. 31, 2021
Subsequent Event [Line Items]
Long-term debt		$ 2,841,425	$ 2,741,900
Term Loan Agreement [Member] | Cascade Natural Gas [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Long-term debt	$ 150,000
Ratio of total debt to total capitalization as specified in debt covenants	65.00%
Term Loan Agreement [Member] | Intermountain Gas Company | Subsequent Event [Member]
Subsequent Event [Line Items]
Long-term debt	$ 125,000
Ratio of total debt to total capitalization as specified in debt covenants	65.00%

X

- Definition

Ratio of total debt to total capitalization as specified in debt convenants.

+ References

No definition available.

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- Definition

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

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