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Debt (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013

 
Amount Outstanding at December 31, 2012

 
Letters of Credit at December 31, 2013

 
Expiration
Date
 
 
 
 
(In millions)
MDU Resources Group, Inc.
Commercial paper/Revolving credit agreement
(a)
$
125.0

 
$
78.9

(b)
$
76.0

(b)
$
—

 
10/4/17
 
Cascade Natural Gas Corporation
Revolving credit agreement
 
$
50.0

(c)
$
11.5

 
$
2.0

 
$
2.2

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

(e)
$
3.0

 
$
26.2

 
$
—

 
7/13/18
 
Centennial Energy Holdings, Inc.
Commercial paper/Revolving credit agreement
(f)
$
500.0

 
$
75.0

(b)
$
217.0

(b)
$
—

 
6/8/17
 
(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 $150 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 million.
(d) The outstanding letter of credit, as discussed in Note 19, reduces the amount available under the credit agreement.
(e) Certain provisions allow for increased borrowings, up to a maximum of $90 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 $650 million). There were no amounts outstanding under the credit agreement.
Long term debt outstanding
Long-term debt outstanding at December 31 was as follows:

 
2013

2012

 
(In thousands)
Senior Notes at a weighted average rate of 5.52%, due on dates ranging from June 19, 2015 to April 15, 2044
$
1,545,078

$
1,349,160

Commercial paper at a weighted average rate of .40%, supported by revolving credit agreements
153,924

293,000

Term Loan Agreements at a weighted average rate of 2.08%, due on dates ranging from April 22, 2014 to April 22, 2023
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

59,000

Other notes at a weighted average rate of 5.23%, due on dates ranging from September 1, 2020 to February 1, 2035
39,863

40,090

Credit agreements at a weighted average rate of 4.11%, due on dates ranging from February 28, 2014 to November 30, 2038
5,701

3,768

Discount
(3
)
(43
)
Total long-term debt
1,854,563

1,744,975

Less current maturities
12,277

134,108

Net long-term debt
$
1,842,286

$
1,610,867