Significant Acquisitions and Divestitures (Purchase Consideration) (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	11 Months Ended
	Feb. 09, 2018	Apr. 30, 2018	Dec. 31, 2018
Silver Run Acquisition Corporation Opco Lp | Alta Mesa RBL
Business Acquisition [Line Items]
Contingent consideration, term			7 years
Economic interests	100.00%
Voting interests	90.00%
AM Contributor
Business Acquisition [Line Items]
Common units (in shares)		1,197,934
Silver Run Acquisition Corporation Opco Lp | Alta Mesa RBL
Business Acquisition [Line Items]
SRII Opco Common Units issued	$ 1,261,249
Estimated fair value of contingent earn-out purchase consideration	284,109
Total consideration paid	$ 1,545,358
Common stock par value (in dollars per share)	$ 7.90
Silver Run Acquisition Corporation Opco Lp | AM Contributor | Alta Mesa RBL
Business Acquisition [Line Items]
Common units (in shares)	138,402,398
Silver Run Acquisition Corporation Opco Lp | Riverstone Contributor Agreement | Alta Mesa RBL
Business Acquisition [Line Items]
Common units (in shares)	20,000,000
As initially reported | Silver Run Acquisition Corporation Opco Lp | Alta Mesa RBL
Business Acquisition [Line Items]
SRII Opco Common Units issued	$ 1,251,782
Estimated fair value of contingent earn-out purchase consideration	284,109
Total consideration paid	1,535,891
Adjustment | Silver Run Acquisition Corporation Opco Lp | Alta Mesa RBL
Business Acquisition [Line Items]
SRII Opco Common Units issued	9,467
Total consideration paid	$ 9,467