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Regulatory matters and revenues subject to refund (Details) (USD $)
 0 Months Ended
Dec. 05, 2013
MTPSC [Member]
Apr. 12, 2013
MTPSC [Member]
Sep. 26, 2012
MTPSC [Member]
Nov. 17, 2013
NDPSC [Member]
Oct. 23, 2013
NDPSC [Member]
Sep. 18, 2013
NDPSC [Member]
Oct. 31, 2013
FERC [Member]
Regulatory matters and revenues subject to refund [Line Items]              
Total gas rate increase requested     $ 3,500,000     $ 6,800,000  
Percent above current rates requested     5.90%     6.40%  
Amount of requested interim increase in annual gas rates     1,700,000     4,500,000  
Requested percentage of interim gas rate increase     2.90%     4.20%  
Interim rate increase (decrease), amount   850,000   4,300,000 4,300,000    
Stipulation, amount 1,500,000            
Settlement agreement, amount         4,300,000    
Settlement agreement, percent         4.00%    
Rate change application annual increase, amount             28,900,000
Increased expenditures covered by change application             $ 312,000,000