Asset Acquisitions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) a	Dec. 31, 2017 USD ($) a
Asset Acquisitions [Line Items]
Net acres acquired | a		1,030
Payments to acquire oil and gas property and equipment | $	$ 2,581	$ 33,255	$ 89,896
Howard and Martin Counties Acquisitions 2017 [Member]
Asset Acquisitions [Line Items]
Net acres acquired | a			3,600
Payments to acquire oil and gas property and equipment | $			$ 76,500