Transactions with Affiliates - Commodity Price Swap Agreements Tables (Details)			12 Months Ended
	Dec. 20, 2017 $ / MMBTU $ / bbl	Dec. 01, 2016 $ / MMBTU $ / bbl	Dec. 31, 2018 $ / MMBTU $ / bbl
DJ Basin Complex [Member] | Years 2017 - 2018 [Member] | Ethane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price			18.41
DJ Basin Complex [Member] | Years 2017 - 2018 [Member] | Propane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price			47.08
DJ Basin Complex [Member] | Years 2017 - 2018 [Member] | Isobutane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price			62.09
DJ Basin Complex [Member] | Years 2017 - 2018 [Member] | Normal Butane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price			54.62
DJ Basin Complex [Member] | Years 2017 - 2018 [Member] | Natural Gasoline [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price			72.88
DJ Basin Complex [Member] | Years 2017 - 2018 [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price			76.47
DJ Basin Complex [Member] | Years 2017 - 2018 [Member] | Natural Gas (per MMBtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price | $ / MMBTU			5.96
DJ Basin Complex [Member] | Year 2017 [Member] | Ethane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price		5.09
DJ Basin Complex [Member] | Year 2017 [Member] | Propane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price		18.85
DJ Basin Complex [Member] | Year 2017 [Member] | Isobutane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price		26.83
DJ Basin Complex [Member] | Year 2017 [Member] | Normal Butane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price		26.20
DJ Basin Complex [Member] | Year 2017 [Member] | Natural Gasoline [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price		41.84
DJ Basin Complex [Member] | Year 2017 [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price		45.40
DJ Basin Complex [Member] | Year 2017 [Member] | Natural Gas (per MMBtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price | $ / MMBTU		3.05
DJ Basin Complex [Member] | Year 2018 [Member] | Ethane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	5.41
DJ Basin Complex [Member] | Year 2018 [Member] | Propane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	28.72
DJ Basin Complex [Member] | Year 2018 [Member] | Isobutane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	32.92
DJ Basin Complex [Member] | Year 2018 [Member] | Normal Butane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	32.71
DJ Basin Complex [Member] | Year 2018 [Member] | Natural Gasoline [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	48.04
DJ Basin Complex [Member] | Year 2018 [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	49.36
DJ Basin Complex [Member] | Year 2018 [Member] | Natural Gas (per MMBtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price | $ / MMBTU	2.21
MGR Assets [Member] | Years 2017 - 2018 [Member] | Ethane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price			23.11
MGR Assets [Member] | Years 2017 - 2018 [Member] | Propane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price			52.90
MGR Assets [Member] | Years 2017 - 2018 [Member] | Isobutane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price			73.89
MGR Assets [Member] | Years 2017 - 2018 [Member] | Normal Butane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price			64.93
MGR Assets [Member] | Years 2017 - 2018 [Member] | Natural Gasoline [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price			81.68
MGR Assets [Member] | Years 2017 - 2018 [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price			81.68
MGR Assets [Member] | Years 2017 - 2018 [Member] | Natural Gas (per MMBtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price | $ / MMBTU			4.87
MGR Assets [Member] | Year 2017 [Member] | Ethane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price		4.08
MGR Assets [Member] | Year 2017 [Member] | Propane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price		19.24
MGR Assets [Member] | Year 2017 [Member] | Isobutane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price		25.79
MGR Assets [Member] | Year 2017 [Member] | Normal Butane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price		25.16
MGR Assets [Member] | Year 2017 [Member] | Natural Gasoline [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price		45.01
MGR Assets [Member] | Year 2017 [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price		53.55
MGR Assets [Member] | Year 2017 [Member] | Natural Gas (per MMBtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price | $ / MMBTU		3.05
MGR Assets [Member] | Year 2018 [Member] | Ethane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	2.52
MGR Assets [Member] | Year 2018 [Member] | Propane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	25.83
MGR Assets [Member] | Year 2018 [Member] | Isobutane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	30.03
MGR Assets [Member] | Year 2018 [Member] | Normal Butane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	29.82
MGR Assets [Member] | Year 2018 [Member] | Natural Gasoline [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	47.25
MGR Assets [Member] | Year 2018 [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	56.76
MGR Assets [Member] | Year 2018 [Member] | Natural Gas (per MMBtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price | $ / MMBTU	2.21