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Basis of Presentation - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Concentration Risk [Line Items]
Goodwill	$ 110,882		$ 0
Accrued capital expenditures	$ 75,300	$ 72,500
Noble Energy \| Revenue
Concentration Risk [Line Items]
Concentration risk		94.00%
Midstream Services Revenue \| Noble Energy \| Revenue
Concentration Risk [Line Items]
Concentration risk	82.00%
Total Revenues \| Noble Energy \| Revenue
Concentration Risk [Line Items]
Concentration risk	57.00%
Customer Concentration Risk \| Total Revenues \| Noble Energy \| Revenue
Concentration Risk [Line Items]
Concentration risk	19.00%
Customer Concentration Risk \| Crude Oil Sales Revenues \| Noble Energy \| Revenue
Concentration Risk [Line Items]
Concentration risk	61.00%