Transactions with Affiliates - Commodity Price Swap Agreements Tables (Details) - Year 2018 [Member]	Dec. 31, 2018 $ / MMBTU $ / bbl	Dec. 20, 2017 $ / MMBTU $ / bbl
DJ Basin Complex [Member] | Ethane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price	18.41
Commodity market price		5.41
DJ Basin Complex [Member] | Propane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price	47.08
Commodity market price		28.72
DJ Basin Complex [Member] | Isobutane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price	62.09
Commodity market price		32.92
DJ Basin Complex [Member] | Normal Butane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price	54.62
Commodity market price		32.71
DJ Basin Complex [Member] | Natural Gasoline [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price	72.88
Commodity market price		48.04
DJ Basin Complex [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price	76.47
Commodity market price		49.36
DJ Basin Complex [Member] | Natural Gas (per MMBtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price | $ / MMBTU	5.96
Commodity market price | $ / MMBTU		2.21
MGR Assets [Member] | Ethane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price	23.11
Commodity market price		2.52
MGR Assets [Member] | Propane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price	52.90
Commodity market price		25.83
MGR Assets [Member] | Isobutane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price	73.89
Commodity market price		30.03
MGR Assets [Member] | Normal Butane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price	64.93
Commodity market price		29.82
MGR Assets [Member] | Natural Gasoline [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price	81.68
Commodity market price		47.25
MGR Assets [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price	81.68
Commodity market price		56.76
MGR Assets [Member] | Natural Gas (per MMBtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price | $ / MMBTU	4.87
Commodity market price | $ / MMBTU		2.21