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Debt (Tables)
 12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Outstanding credit facilities
The following table summarizes the outstanding revolving credit facilities of the Company and its subsidiaries:
Company
Facility
Facility
Limit

 
Amount Outstanding at December 31, 2014

 
Amount Outstanding at December 31,
 2013

 
Letters of
Credit at December 31, 2014

 
Expiration
Date
 
 
(In millions)
MDU Resources Group, Inc.
Commercial paper/Revolving credit agreement (a)
$
175.0

 
$
77.5

(b)
$
78.9

(b)
$
—

 
5/8/19
Cascade Natural Gas Corporation
Revolving credit agreement
$
50.0

(c)
$
—

 
$
11.5

 
$
2.2

(d)
7/9/18
Intermountain Gas Company
Revolving credit agreement
$
65.0

(e)
$
21.0

 
$
3.0

 
$
—

 
7/13/18
Centennial Energy Holdings, Inc.
Commercial paper/Revolving credit agreement (f)
$
650.0

 
$
211.0

(b)
$
75.0

(b)
$
—

 
5/8/19
Dakota Prairie Refining, LLC
Revolving credit agreement
$
50.0

(g)
$
—

 
$
—

 
$
1.0

(d)
12/1/15
(a)
The commercial paper program is supported by a revolving credit agreement with various banks (provisions allow for increased borrowings, at the option of the Company on stated conditions, up to a maximum of $225.0 million). There were no amounts outstanding under the credit agreement.
(b)
Amount outstanding under commercial paper program.
(c)
Certain provisions allow for increased borrowings, up to a maximum of $75.0 million.
(d)
An outstanding letter of credit reduces the amount available under the credit agreement.
(e)
Certain provisions allow for increased borrowings, up to a maximum of $90.0 million.
(f)
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 $800.0 million). There were no amounts outstanding under the credit agreement.
(g)
Certain provisions allow for increased borrowings up to a maximum of $75.0 million.
 
Long term debt outstanding
Long-term debt outstanding at December 31 was as follows:
 
2014

2013

 
(In thousands)
Senior Notes at a weighted average rate of 5.43%, due on dates ranging from June 19, 2015 to November 24, 2055
$
1,636,662

$
1,545,078

Commercial paper at a weighted average rate of .37%, supported by revolving credit agreements
288,500

153,924

Term Loan Agreements at a weighted average rate of 2.12%, due on dates ranging from April 22, 2018 to April 22, 2023
72,000

75,000

Medium-Term Notes at a weighted average rate of 7.32%, due on dates ranging from September 15, 2027 to March 16, 2029
35,000

35,000

Other notes at a weighted average rate of 5.23%, due on dates ranging from September 1, 2020 to February 1, 2035
39,662

39,863

Credit agreements at a weighted average rate of 3.47%, due on dates ranging from February 10, 2015 to November 30, 2038
22,939

5,701

Discount
(36
)
(3
)
Total long-term debt
2,094,727

1,854,563

Less current maturities
269,449

12,277

Net long-term debt
$
1,825,278

$
1,842,286