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Debt (Tables)

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Outstanding credit facilities

The following table summarizes the outstanding revolving credit facilities of the Company's subsidiaries:

Company			Facility			Facility Limit						Amount Outstanding at December 31, 2021			Amount Outstanding at December 31, 2020			Letters of Credit at December 31, 2021						Expiration Date
						(In millions)
Montana-Dakota Utilities Co.			Commercial paper/Revolving credit agreement (a)			$	175.0					$	64.9		$	87.7		$	—					12/19/24
Cascade Natural Gas Corporation			Revolving credit agreement			$	100.0		(b)			$	71.0		$	54.0		$	2.2		(c)			6/7/24
Intermountain Gas Company			Revolving credit agreement			$	85.0		(d)			$	56.5		$	41.9		$	—					6/7/24
Centennial Energy Holdings, Inc.			Commercial paper/Revolving credit agreement (e)			$	600.0					$	385.4		$	37.9		$	—					12/19/24

(a)The commercial paper program is supported by a revolving credit agreement with various banks (provisions allow for increased borrowings, at the option of Montana-Dakota on stated conditions, up to a maximum of $225.0 million). There were no amounts outstanding under the revolving credit agreement.

(b)Certain provisions allow for increased borrowings, up to a maximum of $125.0 million.

(c)(Outstanding letter(s) of credit reduce the amount available under the credit agreement.

(d)(Certain provisions allow for increased borrowings, up to a maximum of $110.0 million.

(e)The commercial paper program is supported by a revolving credit agreement with various banks (provisions allow for increased borrowings, at the option of Centennial on stated conditions, up to a maximum of $700.0 million). There were no amounts outstanding under the revolving credit agreement.

Long term debt outstanding

Long-term debt outstanding was as follows:

			Weighted Average Interest Rate at December 31, 2021			2021			2020
						(In thousands)
Senior Notes due on dates ranging from October 22, 2022 to September 15, 2061			4.32		%	$	2,125,000		$	1,950,000
Commercial paper supported by revolving credit agreements			.40		%	450,300			125,600
Credit agreements due on June 7, 2024			1.94		%	127,500			95,900
Medium-Term Notes due on dates ranging from September 15, 2027 to March 16, 2029			7.32		%	35,000			35,000
Term Loan Agreement due on September 3, 2032			2.00		%	7,700			8,400
Other notes due on dates ranging from January 2, 2022 to January 1, 2061			1.03		%	2,564			4,034
Less unamortized debt issuance costs						6,090			5,803
Less discount						74			1
Total long-term debt						2,741,900			2,213,130
Less current maturities						148,053			1,555
Net long-term debt						$	2,593,847		$	2,211,575

Schedule of debt maturities

Long-term debt maturities, which excludes unamortized debt issuance costs and discount, for the five years and thereafter following December 31, 2021, were as follows:

			2022			2023			2024			2025			2026			Thereafter
			(In thousands)
Long-term debt maturities			$	148,053		$	77,925		$	638,604		$	177,802		$	140,802		$	1,564,878

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