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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]  
Schedule of firm transportation volumes and related demand charges
Period  Dekatherms
per day
   Demand Charges 
Jul 2019 – Mar 2020   58,871   $0.20 - 0.62 
Apr 2020 – May 2020   57,791   $0.20 - 0.56 
Jun 2020 – Oct 2020   56,641   $0.20 - 0.56 
Nov 2020 – Aug 2022   50,341   $0.20 - 0.56 
Sep 2022 – May 2027   30,990   $0.20 - 0.21 
Jun 2027 – May 2036   1,000   $0.20