Summary of Property and Equipment (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) $ / bbl	Sep. 30, 2018 USD ($) $ / bbl	Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Abstract]
Proved Oil and Gas Property, Full Cost Method	$ 1,329,116		$ 1,037,993
Unproved Oil and Gas Property, Full Cost Method	67,865		63,484
Oil and Gas Property, Full Cost Method, Gross	1,396,981		1,101,477
Other property and equipment	25,359		20,383
Total properties and equipment	1,422,340		1,121,860
Accumulated depreciation, depletion and amortization	(323,196)		(193,866)
Property and equipment, net (successful efforts method)	1,099,144		927,994
Unproved Oil and Gas Property excluded	67,900		63,500
Capitalized Exploratory Well Costs	3,500		$ 300
Undeveloped Leasehold Costs Transferred	200	$ 11,400
Capitalized Costs, Proved Properties	3,200	2,400
Interest Costs Capitalized	$ 3,200	$ 7,100
Amortization Expense Per Physical Unit of Production | $ / bbl	17.47	15.83