Commitments and Contingencies (Details)	3 Months Ended
	Mar. 31, 2019 $ / shares Partnership
Apr 2019 - Mar 2020 [Member]
Other Commitments [Line Items]
Capacity levels (Dekatherms per day) | Partnership	58,871
Apr 2019 - Mar 2020 [Member] | Minimum [Member]
Other Commitments [Line Items]
Demand Charges (in dollars per dekatherm)	0.20
Apr 2019 - Mar 2020 [Member] | Maximum [Member]
Other Commitments [Line Items]
Demand Charges (in dollars per dekatherm)	0.62
Apr 2020 - May 2020 [Member]
Other Commitments [Line Items]
Capacity levels (Dekatherms per day) | Partnership	57,791
Apr 2020 - May 2020 [Member] | Minimum [Member]
Other Commitments [Line Items]
Demand Charges (in dollars per dekatherm)	0.20
Apr 2020 - May 2020 [Member] | Maximum [Member]
Other Commitments [Line Items]
Demand Charges (in dollars per dekatherm)	0.56
Jun 2020 - Oct 2020 [Member]
Other Commitments [Line Items]
Capacity levels (Dekatherms per day) | Partnership	56,641
Jun 2020 - Oct 2020 [Member] | Minimum [Member]
Other Commitments [Line Items]
Demand Charges (in dollars per dekatherm)	0.20
Jun 2020 - Oct 2020 [Member] | Maximum [Member]
Other Commitments [Line Items]
Demand Charges (in dollars per dekatherm)	0.56
Nov 2020 - Aug 2022 [Member]
Other Commitments [Line Items]
Capacity levels (Dekatherms per day) | Partnership	50,341
Nov 2020 - Aug 2022 [Member] | Minimum [Member]
Other Commitments [Line Items]
Demand Charges (in dollars per dekatherm)	0.20
Nov 2020 - Aug 2022 [Member] | Maximum [Member]
Other Commitments [Line Items]
Demand Charges (in dollars per dekatherm)	0.56
Sep 2022 - May 2027 [Member]
Other Commitments [Line Items]
Capacity levels (Dekatherms per day) | Partnership	30,990
Sep 2022 - May 2027 [Member] | Minimum [Member]
Other Commitments [Line Items]
Demand Charges (in dollars per dekatherm)	0.20
Sep 2022 - May 2027 [Member] | Maximum [Member]
Other Commitments [Line Items]
Demand Charges (in dollars per dekatherm)	0.21
Jun 2027 - May 2036 [Member]
Other Commitments [Line Items]
Capacity levels (Dekatherms per day) | Partnership	1,000
Demand Charges (in dollars per dekatherm)	0.20