Supplemental Disclosures (Details 1) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Condensed Cash Flow Statements, Captions [Line Items]
Cash paid for interest expense, net of amounts capitalized	$ 37,632	$ 14,286
Increase (decrease) in liabilities for oil and natural gas properties capital expenditures	13,536	(26,389)
Increase (decrease) in liabilities for midstream properties capital expenditures	5,854	(2,371)
Transfer of inventory from oil and natural gas properties	370	343
Transfer of inventory to midstream properties	0	(2,390)
Increase (Decrease) in Liabilities for Accrued Cost to Issue Equity	0	73
Mineral Properties
Condensed Cash Flow Statements, Captions [Line Items]
Increase (decrease) in asset retirement obligations	321	834
Midstream Properties
Condensed Cash Flow Statements, Captions [Line Items]
Increase (decrease) in asset retirement obligations	$ 283	$ 296