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Acquisition - Allocation of Purchase Price (Details) - USD ($) $ in Thousands		6 Months Ended
	Jan. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 111,145	$ 0
Black Diamond Acquisition
Business Acquisition [Line Items]
Cash Consideration	$ 638,500
Black Diamond Gathering LLC
Business Acquisition [Line Items]
PDC Energy Payment		$ 24,100
Black Diamond Gathering LLC \| Black Diamond Acquisition
Business Acquisition [Line Items]
Cash Consideration	638,529
PDC Energy Payment	24,120
Current Liabilities Assumed	18,259
Total Purchase Price and Liabilities Assumed	680,908
Cash	12,518
Accounts Receivable	10,661
Other Current Assets	1,058
Property, Plant and Equipment	205,766
Intangible Assets	339,760
Fair Value of Identifiable Assets	569,763
Goodwill	111,145
Total Asset Value	$ 680,908