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Commitments (Tables)
6 Months Ended
Jun. 30, 2018
Commitments [Abstract]  
Summary of firm transportation volumes and related demand charges
Period   Dekatherms per 
day
    Demand
Charges
 
July 2018 - March 2020     3,230     $ 0.20 - $0.62  
April 2020 - May 2020     2,150     $ 0.20  
June 2020 - May 2036     1,000     $ 0.20