Commitments and Contingencies (Details)	12 Months Ended
	Dec. 31, 2018 USD_Bbl Partnership
January 2019 - March 2020 [Member]
Other Commitments [Line Items]
Capacity levels (Dekatherms per day) | Partnership	3,230
January 2019 - March 2020 [Member] | Minimum [Member]
Other Commitments [Line Items]
Demand Charges (in dollars per dekatherm)	0.20
January 2019 - March 2020 [Member] | Maximum [Member]
Other Commitments [Line Items]
Demand Charges (in dollars per dekatherm)	0.62
April 2020 - May 2020 [Member]
Other Commitments [Line Items]
Capacity levels (Dekatherms per day) | Partnership	2,150
Demand Charges (in dollars per dekatherm)	0.20
June 2020 - May 2036 [Member]
Other Commitments [Line Items]
Capacity levels (Dekatherms per day) | Partnership	1,000
Demand Charges (in dollars per dekatherm)	0.20
Jan 2019 - Oct 2020 [Member]
Other Commitments [Line Items]
Capacity levels (Dekatherms per day) | Partnership	6,300
Demand Charges (in dollars per dekatherm)	0.21
Jan 2019 - Aug 2022 [Member]
Other Commitments [Line Items]
Capacity levels (Dekatherms per day) | Partnership	49,341
Demand Charges (in dollars per dekatherm)	0.21
Sep 2022 - May 2027 [Member]
Other Commitments [Line Items]
Capacity levels (Dekatherms per day) | Partnership	29,990
Demand Charges (in dollars per dekatherm)	0.56