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Debt (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015

 
Amount Outstanding at December 31,
 2014

 
Letters of
Credit at December 31, 2015

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

 
$
44.5

(b)
$
77.5

(b)
$
—

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

(c)
$
—

 
$
—

 
$
2.2

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

(e)
$
47.9

 
$
21.0

 
$
—

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

 
$
18.0

(b)
$
211.0

(b)
$
39.4

 
5/8/19
Dakota Prairie Refining, LLC
Revolving credit agreement
 
$
75.0

 
$
45.5

 
$
—

 
$
18.3

(d)
6/30/16
(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)
Outstanding letter(s) of credit reduce 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.
 
Long term debt outstanding
Long-term debt outstanding at December 31 was as follows:
 
2015

2014

 
(In thousands)
Senior Notes at a weighted average rate of 5.18%, due on dates ranging from February 1, 2016 to January 15, 2055
$
1,616,246

$
1,636,662

Commercial paper at a weighted average rate of .73%, supported by revolving credit agreements
62,500

288,500

Term Loan Agreements at a weighted average rate of 2.16%, due on dates ranging from April 22, 2018 to April 22, 2023
69,000

72,000

Medium-Term Notes at a weighted average rate of 6.68%, due on dates ranging from September 1, 2020 to March 16, 2029
50,000

35,000

Other notes at a weighted average rate of 5.25%, due on February 1, 2035
24,589

39,662

Credit agreements at a weighted average rate of 1.82%, due on dates ranging from July 14, 2018 to November 30, 2038
48,906

22,042

Discount
(9
)
(36
)
Total long-term debt
1,871,232

2,093,830

Less current maturities
243,789

268,552

Net long-term debt
$
1,627,443

$
1,825,278