Commitments and Contingencies (Details) - USD ($) $ in Millions			1 Months Ended		3 Months Ended
	Feb. 25, 2019	Feb. 17, 2017	May 31, 2018	Apr. 30, 2018	Mar. 31, 2019	Mar. 31, 2018
Delivery Of Natural Gas And Oil Production To Third Parties [Member]
Long-term Purchase Commitment [Line Items]
Volume requirement commitment					$ 152.6
Payment for volume requirement agreement					5.0	$ 4.0
Corporate Joint Venture | San Mateo Midstream
Commitments and Contingencies (Textual) [Abstract]
Contractual obligation					$ 205.8
Related Part Transaction, Contract Agreement Term	15 years
Rustler Breaks and Wolf Asset Area | Corporate Joint Venture | San Mateo Midstream
Commitments and Contingencies (Textual) [Abstract]
Term of contractual obligation		15 years
Rustler Breaks Asset Area | Corporate Joint Venture | San Mateo Midstream
Commitments and Contingencies (Textual) [Abstract]
Term of contractual obligation		15 years
Natural Gas Transportation and Fractionation Agreement | Eddy County
Commitments and Contingencies (Textual) [Abstract]
Agreement term					7 years
Contractual obligation					$ 132.3
16-Year Fixed Fee Natural Gas Transportation Agreement | Eddy County
Commitments and Contingencies (Textual) [Abstract]
Agreement term				16 years
Contractual obligation					56.8
10-Year Fixed Fee Natural Gas Transportation Agreement | Eddy County
Commitments and Contingencies (Textual) [Abstract]
Agreement term			10 years
Contractual obligation					$ 202.3
Operational Agreements | San Mateo Midstream
Commitments and Contingencies (Textual) [Abstract]
Contractual obligation	$ 363.8