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Commitment and Contingencies (Tables)
9 Months Ended
Sep. 30, 2018
Commitment and Contingencies [Abstract]  
Summary of firm transportation volumes and related demand charges
Period Dekatherms per day  Demand Charges 
October 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