Asset Acquisitions (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2018 USD ($) a	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Asset Acquisitions [Line Items]
Payments to acquire oil and gas property and equipment		$ 2,581	$ 24,571
Other Martin County Acquisition 2018 [Member]
Asset Acquisitions [Line Items]
Net acres acquired | a	720
Payments to acquire oil and gas property and equipment	$ 24,600