Acquisitions (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	[1]
Property, Plant and Equipment [Line Items]
Contribution of Property	$ 456,100	$ 178,517
Fresh Water Asset [Member]
Property, Plant and Equipment [Line Items]
Contribution of Property	21,500
Energen Contribution [Member]
Property, Plant and Equipment [Line Items]
Contribution of Property	279,000
Energen Contributed Liabilities [Member]
Property, Plant and Equipment [Line Items]
Contribution of Property	3,000
Fresh Water Asset Contribution [Member]
Property, Plant and Equipment [Line Items]
Contribution of Property	32,800
Fresh Water Inventory Contribution [Member]
Property, Plant and Equipment [Line Items]
Contribution of Property	6,000
Tall Tower [Member]
Property, Plant and Equipment [Line Items]
Contribution of Property	110,000
Midstream Assets [Member]
Property, Plant and Equipment [Line Items]
Contribution of Property	18,200
Midstream Land [Member]
Property, Plant and Equipment [Line Items]
Contribution of Property	1,500
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Contribution of Property	$ 1,300

[1] *See Note 1 for information regarding the basis of financial statement presentation.